Kisspeptin cells in the ewe brain respond to leptin and communicate with neuropeptide y and proopiomelanocortin cells K. Backholer, J. Smith, A. Rao, A. Pereira, J. Iqbal, S. Ogawa, Q. Li, I. Clarke 2010 / Vol. 151, pp. 2233 - 2243 / Endocrinology