It's spring, and thoughts turn to...allergies.
D015703:Antigens, CD / Q000737:chemistry / Q000276:immunology; D006801:Humans; D006967:Hypersensitivity / Q000276:immunology*; D007073:Immunoglobulin E / Q000737:chemistry / Q000276:immunology*; D007074:Immunoglobulin G / Q000737:chemistry / Q000276:immunology*; D017434:Protein Structure, Tertiary; D017452:Receptors, IgG / Q000737:chemistry / Q000276:immunology; D012621:Seasons