part_of part of part of testosterone secreting cell Leydig cell BTO:0000755 interstitial cell of Leydig CALOHA:TS-1150 FMA:72297 Note that the Amphibian Anatomy Ontology (AA) has a class 'leydig cells' but this is unrelated EMAPA:29655 cell A Leydig cell is a testosterone-secreting cell in the interstitial area, between the seminiferous tubules, in the testis. interstitial cell Leydig cell region of testis