Pleckstrin
Encyclopedia
Pleckstrin is a protein found in platelet
Platelet
Platelets, or thrombocytes , are small,irregularly shaped clear cell fragments , 2–3 µm in diameter, which are derived from fragmentation of precursor megakaryocytes.  The average lifespan of a platelet is normally just 5 to 9 days...

s. The name derives from platelet and leukocyte C kinase substrate and the KSTR string of amino acids.

It is the source of the name pleckstrin homology domain
Pleckstrin homology domain
Pleckstrin homology domain is a protein domain of approximately 120 amino acids that occurs in a wide range of proteins involved in intracellular signaling or as constituents of the cytoskeleton....

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