Abstract
Summary
Reserpine injected into the dorsal lymph sac of Rana frogs at dose levels of 0.05-0.25 mg was shown to provoke melan-ophore-dispersion in the skin. The melan-ophore index, M.I., in the hind webs of the frog rose from 1 to 5 within 24-72 hours after reserpine injection. Reserpine did not cause any change of skin color in vitro. It is suggested that this effect is due to intensified endogenous MSH secretion.
Our thanks are dur Mr. E. Zawojski for devoted technical assistance.
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