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Phytohemagglutinin, an extract of the kidney bean, Phaseolus vulgaris, induces in human leukocyte cultures an inhibitor of the cytopathic effects of Sindbis virus. The physicochemical and biological properties of this virus-inhibitor are similar to those of interferon induced by Newcastle disease virus, except for an instability at pH 2 and 10 and at 56 degrees C.
Ε. Frederick Wheelock (Fri,) studied this question.