Methods for detecting receptivity of mammalian endometrium to embryo implantation comprising obtaining a sample of the endometrium, contacting the endometrium with a monoclonal antibody for .beta..sub.3 and detecting .beta..sub.3 in the endometrium. The invention also provides for methods of diagnosing...http://www.google.com.au/patents/US5578306?utm_source=gb-gplus-sharePatent US5578306 - Method for preventing embryo implantation