Since infertility in mice and humans is strongly associated with a lack of epididymal molecules [46]–[48], and since the high molecular mass complex containing albumin characterized here is also expressed by human epididymis (unpublished observations), identification of the other molecules present in the epididymal complex recognized by mAb TRA 54 could be helpful in understanding male infertility. The gene discussed is ALB; the disease is Infertility.