Cell Membrane Human Human spermatozoa Immunologic Techniques Lectins Male Receptors, Concanavalin A Receptors, Mitogen Spermatozoa Support, Non-U.S. Gov't concanavalin a cytology drug protein binding human human cell immunohistochemistry lectin receptor lectin receptors male genital system membrane receptor membrane surfaces sperm antigen spermatozoal antigens wheat germ agglutinin