[Role of decidual cells in immunobiologic relationships between mother and fetus]

Rat males were injected with the complete Freund adjuvant. The state of sensibilization to PPD were measured, using lymphoid cells of lymph nodes and of spleen, by means of indirect and direct leucocyte adherence inhibition tests throughout 7-9 and 12-21 days after immunization, resp. No courses of the tests occurred in the presence of the extract of "false" decidua. The extracts of the liver of pregnant females, of the regenerating liver, or of the uterus of non-pregnant females produced no such suppressing effect.