Distribution of ghrelin-ip cells in the testes of the African ostrich. A, ghrelin-ip cells were found in the seminiferous tubules (CST) of the tubular compartments and interstitial tissue (IT) of the testis; B, ghrelin-ip cells were found in the sperm (SP), primary spermatocytes (PS) and Sertoli cells (SC) of the seminiferous tubules; C, ghrelin-ip cells were found in the Leydig cells (L) of the interstitial tissue; D, microphotograph of absorption test in the testes. Arrows indicate ghrelin-ip cells. Scale bar: 100 μm (A) and scale bar: 50 μm (B, C and D).