Probable transcription factor. In adult testis, expressed in differentiating spermatagonia and preleptotene spermatocytes, but not during other stages of spermatogenesis (at protein level). Detected in testis from 13.5 days post coitum (dpc) onwards. Detected in ovary from 13.5 dpc, but levels gradually decline and are undetectable by 3 days post partum (dpp). Belongs to the paired-like homeobox family.