Pleckstrins are a family of proteins found in platelets[1] and other cells. The name derives from platelet and leukocyteCkinase substrate and the KSTR string of amino acids. The prototype protein, now called pleckstrin-1, was first identified in 1979 as the major substrate of protein kinase C in platelets.[2] The homolog pleckstrin-2 is more widely expressed in tissues.[3]