Recent studies have shown that activation of platelets by collagen is
mediated through the same pathway as that used by immune receptors, wi
th pivotal roles for an immunoreceptor tyrosine-based activation motif
(ITAM) sequence on the Fc receptor gamma-chain and the tyrosine kinas
e Syk. Here, Steve Watson and Jonathan Gibbins discuss the implication
for the physiological and pathological regulation of blood platelets.