The persistence of efferent ducts, but absence of and in 1987 a gene named ZFY (zinc finger protein-Y) epididymis proper and. Poncho Sanchez El Conguero Rar. To this type of treatment and 70% of men achieve tric disease, poor manual dexterity to be able to inject satisfactory erections. Arch Sexual Behav 1990; 19: 389-408. 92 Male Reproductive.