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Three preparations of primate pituitary growth hormone, each appearing homogeneous by several physicochemical criteria and having similar growth hormone potencies in the tibia test, were assayed for prolactin activity by the pigeon crop-sac method. The apparent homogeneity of these preparations and the demonstration that all of them possess small but similar pigeon crop-sac-stimulating potencies support the view that prolactin activity may be an intrinsic characteristic of human and simian growth hormone. (Endocrinology82: 1247, 1968)
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Peckham et al. (1968) studied this question.
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