Abstract
Summary
In embryos of the shark, Squalus suckleyi, differentiation of hypothalamic neurosecretory system is accelerated by treatment with thyroxine, triiodothyronine or triiodothyroacetic acid. Early accumulation of stainable neurosecretory granules is stimulated in the preoptico-hypophyseal fibre tract, and in the neurohypophysis.
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