The human peripheral blood lymphocyte provides a readily available in vitro system, representative of the donor's immune status.1 This cell responds to specific antigens to which the donor is sensitized, as well as to certain nonspecific stimulants, such as phytohemagglutinin (PHA), an extract of the kidney bean, Phaseolus vulgaris. PHA has been used for the past 5 years as a mitogenic agent for lympho
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