“…On the basis of analogy with the mammalian hypothalamo-hypophysial system, in which prolactin secretion is under inhibitory control, they proposed that the tadpole growth factor might be prolactin. The observational basis for this suggestion has been confirmed, both with ectopic grafts (Brown, unpublished), and by hypothalectomy which also leaves the pituitary in a deafferented state (Hanoka, 1966;Remy and Bounhiol, 1966;Guardabassi et al, 1961).…”