Phytohaemagglutinin

Phytohaemagglutinin (PHA) is a lectin derived from the seeds of the garden bean (Phaseolus vulgaris). It occurs in the form of tetramers composed of two related polypeptides (PHA-L and PHA-E). The markings L and E correspond to leukoagglutination and erythroagglutination abilities of PHA subunits.

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