Abstract
A variety of experiments carried out in recent years are reviewed and evidence is presented for the presence of non-indolic, pineal antigonadotropic substances in pineal extracts and partially purified pineal fractions. Other data are presented suggesting the presence of prolactin releasing and release-inhibiting substances in bovine pineal glands. Also, the sulfurcontaining amino acid and putative neurotransmitter taurine was found in large quantities in bovine pineals closely associated with fractions possessing antigonadotropic activity.