Decidual extracts suppress antibody response in vitro

Abstract
Extracts of decidual tissue produced in pseudopregnant rats were found to suppress in vitro antibody response to α‐2,4‐d initrophenyl‐polylysine. The peak levels of both the total antibody response and the 2‐m ercaptoethanol‐resistant fraction were reduced. Extracts prepared in a similar manner from uteri of normal untreated or pseudopregnant rats did not exert such an effect.