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PHA-L is purified from Phaseolus vulgaris (red kidney bean) by standard chromatographic techniques.
Phytohemagglutinin (PHA), the lectin extract from the red kidney bean, consists of only L-type subunits (isolectin L4, "leuko-agglutinin"). It is an N-acetylgalactosamine/galactose sugar-specific lectin.
