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GENOSYS–Exam Preparatory Manual for Undergraduates: Biochemistry (A Simplified Approach)
Neethu Lakshmi N, Aiswarya S Lal, Divya JS, Nikhila K, Nimisha PM
SECTION 1: THEORIES
CHAPTER 1:
Cell and Subcellular Organelles
CELL
Prokaryotic and Eukaryotic Cell
Structure of an Animal Cell
Functions of Cellular Organelles
Cell Membrane
Structure of Cell Membrane
LYSOSOMES
Enzymes Present
Clinical Correlation of Lysosomes
PEROXISOMES
Enzymes Present
Clinical Correlation of Peroxisomes
MITOCHONDRIA
Functions
MARKER MOLECULES
TRANSPORT MECHANISMS
Passive Transport
Simple Diffusion
Facilitated Diffusion
Ion Channels
Active Transport
TRANSPORT SYSTEMS
Types
Uniport
Cotransport
CHAPTER 2:
Enzymology
ENZYMES
NOMENCLATURE
Trivial Names
IUBMB System of Classification
PROSTHETIC GROUPS, COFACTORS AND COENZYMES
Prosthetic Groups
Cofactors
Coenzymes
ENZYME KINETICS
MICHAELIS-MENTEN THEORY
FACTORS AFFECTING ENZYME ACTIVITY
Substrate Concentration
Temperature
Effect of pH
Covalent Modification
INHIBITION OF ENZYME ACTIVITY
General Types of Inhibitors
Competitive Inhibitor
Uncompetitive Inhibitor
Pure Non-competitive Inhibitor
REGULATION OF ENZYME ACTIVITY
Regulation of Rate of Synthesis or Degradation
Allosteric Regulation
SPECIFICITY OF ENZYMES
CLINICAL ENZYMOLOGY
Cardiac Biomarkers
Isoenzymes
Creatine Phosphokinase
Lactate Dehydrogenase
Troponin
Alkaline Phosphatase
ENZYME PATTERN (ENZYME PROFILE) IN DISEASES
Hepatic Diseases
Myocardial Infarction
Muscle Diseases
Bone Diseases
Prostate Cancer
CHAPTER 3:
Carbohydrates
FUNCTIONS OF CARBOHYDRATES
CLASSIFICATION OF CARBOHYDRATES
Monosaccharides
Reactions of Monosaccharides
Disaccharides
Sucrose
Lactose
Maltose
Polysaccharide
Starch
Glycogen
Cellulose
Heteropolysaccharide
Mucopolysaccharides
Hyaluronic Acid
Heparin
Chondroitin Sulfate
Keratan Sulfate
Dermatan Sulfate
Glycoproteins
METABOLISM OF CARBOHYDRATES
Clinical Correlation: Lactose Intolerance
GLYCOLYSIS (EMBDEN-MEYERHOF-PARNAS PATHWAY)
Irreversible Enzymes of Glycolysis
Hexokinase
Phosphofructokinase-1
Pyruvate Kinase
Energy Yield from Glycolysis
Regulation of Glycolysis
CORI CYCLE (LACTIC ACID CYCLE)
Significance
RAPOPORT-LUEBERING REACTION
Significance
Energetics
GLUCONEOGENESIS
Key Gluconeogenic Enzymes
Pyruvate Carboxylase Reaction
Phosphoenolpyruvate Carboxykinase
Fructose 1,6-bisphosphatase
Glucose-6-phosphatase Reaction
Glucose-alanine Cycle
Regulation of Gluconeogenesis
Availability of Substates
GLYCOGEN METABOLISM
Glycogenesis
Activation of Glucose
Glycogen Synthase Action
Formation of Branches in Glycogen
Glycogenolysis
Action of Glycogen Phosphorylase
Action of Debranching Enzyme
Formation of Glucose-6-phosphate and Glucose
Regulation of Glycogen Metabolism
Allosteric Regulation of Glycogen Metabolism
Hormonal Regulation of Glycogen Metabolism
Influence of Calcium
Regulation of Glycogen Synthesis by cAMP
Effect of Ca2+ Ions on glycogenolysis
Glycogen Storage Diseases
BLOOD GLUCOSE REGULATION
Insulin
Metabolic Effects of Insulin
Mechanism of Action of Insulin
GLUCAGON
Metabolic Effects of Glucagon
GLUCOSE TOLERANCE TEST
Diagnostic Criteria for OGTT
Indications for OGTT
Contraindications for OGTT
Abnormal GTT Curve
DIABETES MELLITUS
Insulin-dependent DiabetesMellitus (Type 1)
Non-insulin-dependent Diabetes Mellitus (Type 2)
Clinical Correlation
Acute Metabolic Complications Diabetic Keto Acidosis
Chronic Complications
Laboratory Investigations in Diabetes
Management of Diabetes Mellitus
Hypoglycemia
Causes
PENTOSE PHOSPHATE PATHWAY
Regulation of Pentose Phosphate Pathway
Significance
Generation of Reducing Equivalents
Free Radical Scavenging
Erythrocyte Membrane Integrity
Detoxification of Drugs
Prevention of Methemoglobinemia
Lens of Eye
Macrophage Bactericidal Activity
Availability of Ribose
Adenosine Triphosphate
Clinical Correlation
GLUCURONIC ACID PATHWAY OF GLUCOSE METABOLISM
Uses
Essential Pentosuria
POLYOL PATHWAY OF GLUCOSE
FRUCTOSE METABOLISM
Hereditary Fructose Intolerance
Fructosuria
GALACTOSE METABOLISM
Galactosemia
Diagnosis
Treatment
METABOLISM OF ALCOHOL
Alcohol Dehydrogenase
Aldehyde Dehydrogenase
Metabolic Changes
Chronic Alcoholism
CHAPTER 4:
Proteins and Amino Acids
AMINO ACIDS
Classification
Based on Structure
Based on Side Chain
Based on Metabolism
Based on Nutrition
Structure
Ionization of Amino Acids
Reactions of Amino Acids
Decarboxylation
Amide Formation
Transamination
Oxidative Deamination
Formation of Carbamino Compound
Transmethylation
Ester Formation by the -OH Group
Reaction of the Amide Group
Reactions of -SH Group
Amino Acid Derivatives
PROTEINS
Structure of Proteins
Primary Structure
Secondary Structure
Tertiary Structure
Quaternary Structure
Classification of Proteins
Based on Functions
Based on Composition and Solubility
Based on the Shape
Based on Nutritional Value
Biologically Important Peptides
METABOLISM OF AMINO ACIDS
Digestion of Proteins
1. Gastric Digestion of Proteins
2. Pancreatic Digestion of Proteins
3. Intestinal Digestion of Proteins
Absorption of Amino Acids
Amino Acid Pool
Metabolism of Ammonia
1. Transamination
2. Transdeamination
Urea Cycle
Steps
Overall Reaction and Energetics of Urea Cycle
Regulation of the Urea Cycle
Disorders of Urea Cycle
Urea Level in Blood
ONE-CARBON METABOLISM
Generation of One-carbon Groups
Role of Methionine and Vitamin B12 in One-carbon Metabolism
Utilization of One-carbon Groups
AMINO ACID METABOLISM
Glycine (G)
Synthesis of Glycine
Metabolism of Glycine
Clinical Correlation
Sulfur-containing Amino Acids
Methionine
Cysteine
Glutamic Acid
Metabolic Fate of Glutamic Acid
Gamma-aminobutyric Acid
Glutamine
Metabolic Fates of Glutamine
Aromatic Amino Acids
Phenylalanine and Tyrosine
Vanillylmandelic Acid Estimation
Phenylketonuria
Alkaptonuria
Albinism
Tryptophan
Kynurenine Pathway
Serotonin Pathway
Branched-chain Amino Acids
Clinical Correlation
Laboratory Findings
Treatment
CHAPTER 5:
Lipids
CHEMISTRY OF LIPIDS
FUNCTIONS OF LIPIDS
CLASSIFICATION OF LIPIDS
Simple Lipids
Compound Lipids
Derived Lipids
Lipids Complexed to Other Compounds
FATTY ACIDS
Clinical Correlations
Classification of Fatty Acids
Saturated and Unsaturated Fatty Acids
Physical and Chemical Properties of Fatty Acids
Essential Fatty Acids
Clinical Correlation
Phospholipids
Glycerophospholipids
Sphingomyelin (Sphingophospholipids)
Functions of Phospholipids
Glycolipids
Metabolism of Fatty Acids
Digestion of Lipids
Clinical Correlation
Steps in Lipid Absorption
Beta-oxidation
Fatty Acid Activation
Transport of Acyl-CoA
Beta-oxidation Proper
Clinical Correlation
Oxidation of Palmitoyl-CoA
Energetics of Beta-oxidation
Clinical Correlation
OXIDATION OF ODD-CHAIN FATTY ACIDS
Alpha-oxidation
Refsum's Disease
Omega-oxidation
Fatty Acid Synthase Complex
Advantages of Multienzyme Complex
First Domain or Condensing Unit
Second Domain or Reduction Unit
Third Domain or Releasing Unit
De novo Synthesis of Fatty Acids (Lynen Cycle)
Production of Acetyl-CoA and NADPH
Formation of Malonyl-CoA
Reaction of Fatty Acid Synthase Complex
TRIACYLGLYCEROLS
Fats as Stored Fuel
Fats Primarily Occur in Adipose Tissue
Structures of Acylglycerols
Properties of Triacylglycerols
Synthesis of Triglycerides
Metabolism of Adipose Tissue
Fatty Liver and Lipotropic Factors
KETONE BODIES
Ketogenesis
Regulation of Ketogenesis
Ketolysis
Ketosis
Causes for Ketosis
Salient Features of Ketosis
CHOLESTEROL AND LIPOPROTEINS
Functions of Cholesterol
Cholesterol Biosynthesis
Regulation of Cholesterol Synthesis
Degradation of Cholesterol
Plasma Lipid Profile
LIPOPROTEINS
Classification of Lipoproteins
Apolipoproteins
Very Low-density Lipoproteins
Low-density Lipoproteins
High-density Lipoprotein
Disorders of Plasma Lipoproteins
FREE FATTY ACIDS
POLYUNSATURATED FATTY ACIDS
EICOSANOIDS
Prostaglandins
Synthesis of Prostaglandins
Biochemical Actions
Leukotrienes
SPHINGOLIPIDOSES OR LIPID STORAGE DISEASES
Gaucher's Disease
Tay-Sachs Disease
Krabbe's Disease
Niemann-Pick Disease
HYPERCHOLESTEROLEMIA
Control of Hypercholesterolermia
ATHEROSCLEROSIS
Class 1: Modifiable Risk Factors, Interventions have Been Proved to Lower CAD Risk
Class 2: Modifiable Risk Factors, Interventionsare Likely to Lower CAD Risk
Class 3: Non-modifiable Risk Factors
Prevention
CHAPTER 6:
Cellular Energetics
CITRIC ACID CYCLE
Reactions of Tricarboxylic Acid Cycle
Significance
Complete Oxidation of Acetyl-CoA
Carbon Dioxide Removal Steps
ATP Generating Steps in TCA Cycle
Importance
Final Common Oxidative Pathway
Integration of Major Metabolic Pathways
Carbohydrates are Required for Oxidation of Fats
Excess Carbohydrates are Converted to Neutral Fat
Amino Acids Finally Enter the TCA
Amphibolic Pathway
SUMMARY
HIGH-ENERGY COMPOUNDS
Significance
ELECTRON TRANSPORT CHAIN
Proton Gradient
Complexes
NADH Dehydrogenase (Complex I)
Succinate Dehydrogenase (Complex II)
Coenzyme Q-dependent Cytochrome c Reductase (Complex III)
Cytochrome c Oxidase (Cytochrome a-a3 Complex) (Complex IV)
F1F0-ATPase = ATP Synthase (Complex V)
Regulation of the Electron Transport Pathway
OXIDATIVE PHOSPHORYLATION
CHEMIOSMOTIC HYPOTHESIS
Mechanism of ATP Synthesis
Inhibitors of Electron Transport Chain
Uncouplers
Uses
CHAPTER 7:
Nutrition
VITAMINS
FAT-SOLUBLE VITAMINS
Vitamin A
Absorption of Vitamin A
Transport from Liver to Tissues
Biochemical Role of Vitamin A
Recommended Daily Allowance
Dietary Sources of Vitamin A
Deficiency Manifestations
Hypervitaminosis
Vitamin D (Cholecalciferol)
Formation of Vitamin D (Fig. 7.3)
Biochemical Role of Vitamin D
Recommended Daily Allowance
Dietary Sources of Vitamin D
Deficiency Manifestations of Vitamin D
Rickets
Clinical Features of Osteomalacia
Hypervitaminosis D
Vitamin E (Tocopherol)
Chemistry
Biochemical Role of Vitamin E
Vitamin E and Selenium
Recommended Daily Allowance of Vitamin E
Dietary Sources
Deficiency Manifestations
Hypervitaminosis
Vitamin K
Biochemical Role of Vitamin K
Recommended Daily Allowance
Dietary Sources of Vitamin K
Deficiency Manifestations
Hypervitaminosis of Vitamin K
WATER-SOLUBLE VITAMINS
Thiamine (Vitamin B1)
Chemistry
Biochemical Functions
Recommended Daily Allowance
Dietary Sources
Deficiency Manifestations
Vitamin B2 (Riboflavin)
Chemistry
Biochemical Functions
Recommended Daily Allowance
Dietary Sources
Deficiency Manifestations
Vitamin B3 (Niacin)
Chemistry
Biochemical Functions
Recommended Daily Allowance
Dietary Sources
Deficiency Manifestations
Vitamin B6 (Pyridoxal Phosphate)
Coenzyme
Biochemical Functions
Recommended Daily Allowance
Dietary Sources of Vitamin B6
Deficiency Manifestations
Vitamin B9 (Folic Acid)
Chemistry
Recommended Daily Allowance
Dietary Sources
Deficiency Manifestations
Vitamin B12 (Cobalamin)
Chemistry
Absorption of Vitamin B12
Biochemical Functions
Recommended Daily Allowance
Dietary Sources
Causes of B12 Deficiency
Deficiency Manifestations
Vitamin C (Ascorbic Acid)
Chemistry
Biochemical Functions
Recommended Daily Allowance
Dietary Sources
Deficiency Manifestations
MINERALS
Calcium
Sources of Calcium
Recommended Daily Allowance
Biological Function
Absorption
Calcium Homeostasis
Calcitriol
Parathyroid Hormone
Action on the Bone (Fig. 7.10)
Mechanism of Action of PTH (Fig. 7.11)
Calcitonin
Plasma Calcium Disease
Iron
Requirement of Iron
Sources of Iron
Biochemical Role of Iron
Absorption
Abnormal Metabolism of Iron
Copper
Recommended Daily Allowance
Dietary Sources
Physiological Functions
Copper-containing Enzymes
Abnormal Metabolism of Copper
Clinical Features
Zinc
Recommended Daily Allowance
Dietary Sources
Biological Functions
Fluorine
Recommended Daily Allowance
Sources
Physiological Functions
Abnormal Metabolism of Fluorine
Selenium
Recommended Daily Allowance
Physiological Functions
Abnormal Metabolism of Selenium
PROTEIN ENERGY MALNUTRITION
CHAPTER 8:
Tissue Biochemistry
HEME SYNTHESIS
Structure of Heme
Biosynthesis of Heme
Step 1: Formation of d-aminolevulinate Acid
Step 2: Synthesis of Porphobilinogen
Step 3: Formation of Uroprophyrinogen
Step 4: Synthesis of Coproporphyrinogen
Step 5: Synthesis of Protoporphyrinogen
Step 6: Generation of Protoporphyrin
Step 7: Generation of Heme
Regulation of Heme Synthesis
Disorders of Heme Synthesis
Porphyrias
HEME CATABOLISM
Generation of Bilirubin
Transport of Bilirubin to Liver
Conjugation
Excretion of Bilirubin into Bile
Fate of Bilirubin
Enterohepatic Circulation
Plasma Bilirubin
van den Bergh Test for Bilirubin
Hyperbilirubinemia
Congenital Hyperbilirubinemias
Acquired Hyperbilirubinemias
HEMOGLOBIN
Structure of Hemoglobin
Transport of Oxygen by Hemoglobin
Oxygen Dissociation Curve
Heme-Heme Interaction and Cooperativity
Effect of pH and pCO2
Bohr Effect
Chloride Shift
Effect of Temperature
Effect of 2,3-Bisphosphoglycerate
Transport of Carbon Dioxide
Hemoglobin Derivatives
Fetal Hemoglobin (HbF)
Methemoglobin (MetHb)
Carboxyhemoglobin (COHb)
Abnormal Hemoglobins
Hemoglobin S (HbS) or Sickle Cell Hemoglobin
Diagnosis of Sickle Cell Anemia
Thalassemias
Alpha Thalassemia
Beta Thalassemia
MYOGLOBIN
IMMUNOCHEMISTRY
IMMUNITY
Types of Immunity
Acquired Immunity
Mechanism of Immunity
Cell-mediated Immunity
Humoral Immunity
IMMUNOGLOBULINS
Salient Features of Immunoglobulins
Classification of Immunoglobulin
Immunoglobulin G
Immunoglobulin A
Immunoglobulin M
Immunoglobulin D
Immunoglobulin E
Multiple Myeloma
Electrophoretic Pattern
Bence-Jones Proteins
Amyloidosis
Clinical Correlation
ACID-BASE BALANCE
Acids and Bases
MAINTENANCE OF BLOOD PH
BUFFERS OF THE BODY FLUIDS
Bicarbonate Buffer System
Phosphate Buffer System
Protein Buffer System
RESPIRATORY REGULATION OF PH
Hemoglobin as a Buffer
RENAL REGULATION OF PH
Excretion of H+, Generation of Bicarbonate
Reabsorption of Bicarbonate
Excretion of H+ as Titratable Acid
Excretion of Ammonium Ions
DISTURBANCES IN ACID-BASE BALANCE
Anion Gap
Metabolic Acidosis
High Anion Gap Metabolic Acidosis
Normal Anion Gap Metabolic Acidosis
Decreased Anion Gap
Osmolal Gap
Compensation of Metabolic Acidosis
Clinical Correlation
Metabolic Alkalosis
Respiratory Acidosis
Respiratory Alkalosis
PLASMA PROTEINS
Albumin
Synthesis
Functions
Clinical Correlation
Globulin
Hypergammaglobulinemias
TRANSPORT PROTEINS
ACUTE PHASE PROTEINS
C-reactive Protein
Ceruloplasmin
Alpha-1 Antitrypsin (AAT)
CHAPTER 9:
Molecular Biology
PURINE AND PYRIMIDINE METABOLISM
Biosynthesis of Purine Nucleotides
Salvage Reactions
Clinical Correlation
Biosynthesis of Pyrimidine Nucleotides
Clinical Correlation
DNA STRUCTURE
Watson and Crick Model of DNA Structure
REPLICATION OF DNA
Origin of Replication
Replication Fork
Basic Molecular Events at Replication Forks
Other Factors Needed for Propagation of Replication Forks
Replisome
Termination of Replication
DNA REPAIR MECHANISM
Clinical Correlations
TRANSCRIPTION AND TRANSLATION
Transcription
Initiation
Elongation
Termination
Translation
Ribosome
Phases
MUTATIONS
Mutagenic Agents
Classification
First Type
Second Type
Manifestations of Mutation
Lethal Mutations
Silent Mutations
Beneficial Mutations
Carcinogenic Effect
REGULATION OF GENE EXPRESSION
Lactose Operon
RECOMBINANT DNA TECHNOLOGY
Applications
Vectors
GENE THERAPY
Procedure
Introducing Genes
Retrovirus
GENETIC CODE
Features
TRANSFER RNA
CHAPTER 10:
Xenobiotics
FREE RADICALS
Types of Free Radicals
Features of Free Radicals
Reactive Oxygen Species
OXIDATIVE STRESS
Generation of Free Radicals
LIPID PEROXIDATION
Initiation Phase
Propagation Phase
Termination Phase
Role of Free Radicals in Diseases
Free Radical Scavenger Systems
Superoxide Dismutase
Glutathione Peroxidase
Glutathione Reductase
Catalase
Polyphenols
ANTIOXIDANTS
Role of Antioxidants
Preventive Antioxidants
Chain-breaking Antioxidants
Important Antioxidants
Antioxidants Used as Therapeutic Agents
Commercial Use of Antioxidants
METABOLISM OF XENOBIOTICS OR DETOXIFICATION
Salient Features of Cytochrome P450
Phases of Detoxification
Phase One Reactions
Phase Two Reactions (Conjugations)
Phase Three Reactions
CHAPTER 11:
Cancer
TUMORS
CANCER
Definition of Cancer
Etiology of Cancer
Molecular Basis of Cancer
Oncogenes
Proto-oncogenes
Antioncogenes or Oncosuppressor Genes
TUMOR MARKERS
Importance
ANTICANCER DRUGS
APOPTOSIS
CHAPTER 12:
Biotechniques
ELECTROPHORESIS
Factors Affecting Electrophoresis
Types of Electrophoresis
Normal Pattern
Abnormal Patterns in Clinical Disease
POLYMERASE CHAIN REACTION
Principle
Reaction Cycle
Denaturation
Primer
Extension
Applications of Polymerase Chain Reaction
RADIOIMMUNOASSAY
ENZYME-LINKED IMMUNOSORBENT ASSAY
Indirect ELISA
Sandwich ELISA
DNA FINGERPRINTING
Restriction Fragment Length Polymorphism
Clinical Correlations
TOOLS IN BIOCHEMISTRY BLOTTING TECHNIQUES
Types of Blotting Techniques
Southern Blotting
Northern Blotting
Western Blotting
CHAPTER 13:
Clinical Chemistry
LIVER FUNCTION TESTS
Functions of Liver
Classification of Liver Function Tests
Based on Laboratory Findings
Based on Clinical Aspects
Clinical Correlation
RENAL FUNCTION TESTS
Functions of Kidney
Classification of Renal Function Tests
To Screen for Kidney Disease
To Assess Renal Function
Clinical Correlation
Glomerular Function
Glomerular Filtration Rate
Renal Threshold and Tubular Maximum
GASTRIC FUNCTION TESTS
Tests to Assess Gastric Function
Fractional Test Meal
Alcohol Test Meal
Pentagastrin Stimulation Test
Augmented Histamine Test Meal
Insulin Test Meal (Hollander's Test)
Tubeless Gastric Analysis
SECTION 2: PRACTICALS
CHAPTER 14:
Qualitative Analysis
SCHEME FOR IDENTIFICATION OF IMPORTANT BIOLOGICAL PRODUCTS
REACTIONS OF CARBOHYDRATES (TABLE 14.1)
Related Test
COLOR REACTIONS OF PROTEINS (Table 14.2)
Reactions of Casein (Table 14.4)
REACTIONS OF NON-PROTEIN NITROGENOUS SUBSTANCES
CHAPTER 15:
Quantitative Analysis
INTRODUCTION TO CLINICAL BIOCHEMISTRY
Colorimetry
Blood Glucose Estimation(Folin-WU Tube Method)
Estimation of Serum Proteins (Biuret Method)
Estimation of Serum Creatinine (Jaffe's Method)
Estimation of Urea in Blood
CHAPTER 16:
Urine Analysis
PHYSICAL CHARACTERISTICS OF URINE
Color
Odor
Turbidity
pH
Volume
Specific Gravity
Urinometer
CHEMICAL CONSTITUENTS OF URINE
Qualitative Analysis of Urine for Abnormal Constituents
Glucose
Albumin
Ketone bodies
CHAPTER 17:
Biochemical Pathways
Viva Voce
CELL AND SUBCELLULAR ORGANELLES
ENZYMOLOGY
CARBOHYDRATES
PROTEINS AND AMINO ACIDS
LIPIDS
CELLULAR ENERGETICS
NUTRITION
TISSUE BIOCHEMISTRY
MOLECULAR GENETICS
CANCER
BIOTECHNIQUES
CLINICAL CHEMISTRY
APPENDIX 1:
Important Topics
CELL AND SUBCELLULAR ORGANELLES
Essay
Short Notes
ENZYMOLOGY
Essay
Short Notes
CARBOHYDRATES
Essays
Short Notes
PROTEINS AND AMINO ACIDS
Essays
Short Notes
LIPIDS
Essays
Short Notes
CELLULAR ENERGETICS
Essays
Short Notes
NUTRITION
Essays
Short Notes
TISSUE BIOCHEMISTRY
Essays
Short Notes
MOLECULAR BIOLOGY
Essays
Short Notes
XENOBIOTICS
Essay
Short Notes
CANCER
Short Notes
BIOTECHNIQUES
Essay
Short Notes
CLINICAL CHEMISTRY
Essay
Short Note
APPENDIX 2:
Multiple Choice Questions
INDEX
TOC
Index
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