Abstract
Summary
1. It was observed that a relaxin preparation extracted from swine ovaries contained a spreading factor which was inactivated by heating at 50°C for ten minutes. The inactivation of the spreading factor did not diminish the effectiveness of the relaxin preparation to cause pelvic relaxation. 2. The spreading factor extracted from the mammary glands of pregnant rats had no ability to cause pelvic relaxation in the amounts employed.
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