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<p>to as ?:? (or ??) T cells, though a minority of T cells express an alternate receptor, formed by variable gamma (?) and delta (?) chains, referred as <a href="page.php?w=Gamma_delta_T_cell">?? T cells</a>.</p>

<p>Each chain is composed of two extracellular domains: Variable (V) region and a Constant (C) region, both of <a href="page.php?w=Immunoglobulin_superfamily">Immunoglobulin superfamily</a> (IgSF) <a href="page.php?w=Immunoglobulin_domain">domain</a> forming antiparallel <a href="page.php?w=Beta_sheet">?-sheets</a>. The Constant region</p><p>
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