Abstract
Summary
The response of 4-day-old rats to various anterior pituitary extracts has been described. It was noted that 4-day-old rats responded with adrenal hypertrophy and thymic atrophy to much smaller amounts of A-C-T than 21-23-day-old rats. Mammotropic and growth preparations did not cause adrenal hypertrophy and thymic atrophy. It is concluded that the 4-day-old rats will be a more sensitive test animal for A-C-T preparations.
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