IN P series of papers Madinaveitia [1938; 1939, 1, 2; 1940, 1, 2, 3] has recently described investigations into diffusing factors that have been prepared as concentrates, mainly from bull testicle, but also from "Padutin" (Bayer), a commercial preparation of kallikrein, from bacterial cultures, from snake venom and from leecri extracts. It has been suggested by
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Bacharach et al. (1940) studied this question.
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