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<td> αβ dimer: α, 125; β, 122 </td>
<td> GlycoproteinⅡb (GPⅡb) αⅡb integrin chain; forms platelet fibrinogen receptor by association with GP Ⅲa </td>
<td> Platelets, megakaryocytes</td> <td> Subunit of platelet fibrinogen receptor, which mediates platelet aggregation by acting as receptor for fibrinogen; possibly also receptor for von Willebrand factor, fibronectin, and thrombospondin </td>
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<td bgcolor="#cccccc"><strong> CD42a,b,c,d</strong></td>
<td bgcolor="#cccccc"> a, 23; <br /> b, 135,23; <br /> c, 22;</td> <td bgcolor="#cccccc"> a, GPIX; b, GPIb-α; c, GPIb-β; d, GPV</td> <td bgcolor="#cccccc"> Platelets, megakaryocytes </td> <td bgcolor="#cccccc"> Adhesion of platelets to endothelium; amplification of platelet response to thrombin </td>
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<td><strong> CD43</strong></td>
<td> 95-115 in <br /> T cells, 115-135 in neutrophils</td> <td> gpL115, leukocyte sialoglycoprotein, leukosialin, sialophorin </td> <td> All leukocytes except most resting B cells </td> <td> Possible anti-adhesive ("barrier") molecule mediating repulsion between leukocytes and other cells </td>
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