passages.id: split_4_test_2958_passage
passages.type: progene_text
passages.text: The mRNA expression of cytochrome P450 side - chain cleavage , 17 alpha-hydroxylase cytochrome P450 , 17 beta-hydroxysteroid dehydrogenase type III , 3 beta-hydroxysteroid dehydrogenase I ( 3 beta HSDI ) , steroidogenic acute regulatory protein , and relaxin - like factor were similar in newborn ( -/- ) and ( +/+ ) testes , but became gradually very low / undetectable in ( -/- ) mice .