“…In this respect, a wealth of interesting data has been obtained in neuroendocrine research on amphibians, e.g. as to the plasticity of behavior (Denver, 1997), the identification of novel neuropeptides (Chartrel et al, 1999), their mechanisms of action (Montero et al, 2000;Yon et al, 2001), the structure and development of the hypothalamo-hypophyseal system (Jansen et al, 1997;Aida et al, 1999;Kikuyama et al, 1999) and pituitary cell heterogeneity (Gracia-Navarro et al, 1998;Gonzalez de Aguilar et al, 1999) (for refs, śee also Vaudry and Eberle, 1993;Vaudry et al, 1998).…”