= Immunoglobulin heavy chain
{title2=$H$}
{wiki}
An <immunoglobulin heavy chain> extends through an arm and the stem of the illustrated <IgG>.
Its <IgG> <protein domains> run from the <N-terminus> as $V_H,C_{H1},C_{H2},C_{H3}$: the first pair contributes to <Fab fragments>, the last pair to the <Fc fragment>.<Immunobiology: The Immune System in Health and Disease, 5th edition by Charles A. Janeway, Jr. and others/The structure of a typical antibody molecule>[Immunobiology: The Immune System in Health and Disease, 5th edition by Charles A. Janeway, Jr. and others; §§3-2–3-3: four heavy-chain domains and their allocation to fragments]{ref}
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