1. Sullivan KA, Silverman A-J. The ontogeny of gonadotropin-releasing hormone neurons in the chick. Neuroendocrinology. 1993;58:597–608.
2. Spratt DI, O’Dea LSL, Schoenfeld D, Butler J, Rao PN, Crowley Jr WF. Neuroendocrine-gonadal axis in men: frequent sampling of LH, FSH, and testosterone. Am J Physiol. 1998;254:E658–66.
3. Bilinska B, Genissel C, Carreau S. Paracrine effect of seminiferous tubule factors on rat leydig cell testosterone production: role of cytoskeleton. Biol Cell. 1997;89:435–42.
4. Charlton H. Hypothalamic control of anterior pituitary function: a history. J Neuroendocrinol. 2008;20:641–6.
5. Payne A, Hardy M, Russell L. The Leydig cell. Vienna, FL: Cache River Press; 1996. p. 301–4.