A clean, simplified medical study infographic on "Human Antibodies & Immunology" with these sections: 1. IMMUNOGLOBULIN STRUCTURE (top left box, blue): - Light Chains: Kappa (Km allotype) | Lambda (λ1, λ2, λ3, λ4 allotypes) - Heavy Chains: IgG(γ1-γ4), IgM(μ), IgA(α1,α2), IgD(δ), IgE(ε) - Variable region → antigen binding | Constant region → determines class - Complement fixation: constant region of heavy chain 2. ANTIBODY QUICK FACTS (top right box, purple): - Highest blood concentration: IgG - First antibody in primary response: IgM - Fetal synthesis begins: 5th month (IgM & IgA) - Plasma cells secrete: IgM, IgG, IgA, IgE, IgD (all except IgD) - IgM structure: J chain + S component - IgA: 2 portions (J chain & S component) - Immunoglobulin on basophils & mast cells: IgE 3. HALF-LIVES TABLE (middle, orange): IgG1/2/3: 23 days | IgG4: 23 days | IgA: 7 days | IgM: 5 days | IgD: 2.8 days | IgE: 2 days 4. CELL MEDIATED IMMUNITY (bottom left, green): - T-lymphocytes (thymus-derived) → cellular immunity - B-lymphocytes (bursa-derived) → humoral immunity (antibodies) - T:B ratio = 3:1 - During embryonic dev: B-lymphocyte precursors from yolk sac & fetal liver 5. MHC / HLA (bottom right, red): - HLA genes on chromosome 6 short arm - MHC Class I: 3 loci (A, B, C) - MHC Class II: DP, DQ, DR loci - Co-dominant inheritance, Mendelian Use clear icons, color-coded boxes, bold headings, minimal text, easy-to-read layout for medical students.