A tribute to Samuel MacDonald McCann (1925-2007): in honor of one of the last pioneers of neuroendocrinology - Antunes-Rodrigues, José; Castro, J. C. Bedran de; Franci, Celso Rodrigues; Anselmo-Franci, Janete Aparecida; Moura, C. C. Pazos de; Moura, E. G.; Marubayashi, U. (Brazilian Journal of Medical and Biological Research, 2007)