Lnk is an SH2 domain-containing adapter protein that inhibits cytokine signaling. Lnk−/− mice exhibit a marked increase in numbers of hematopoietic stem cells, megakaryocytes and platelets, presumably due to the lack of negative regulation in thrombopoietin-mediated signals by Lnk. We previously reported that Lnk might play an unanticipated role in platelet integrin αIIbβ3 outside-in signaling. Lnk−/− platelets exhibited defects in full spreading on fibrinogen, clot retraction and formation of thrombi on collagen under flow conditions while they showed normal inside-out signaling (
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