passages.id: split_4_test_1837_passage
passages.type: progene_text
passages.text: Among these isoenzymes , 17 beta HSD type 2 ( 17 beta HSD2 ) catalyses the conversion of testosterone into androstenedione and/or oestradiol into oestrone in various tissues , and it has thus been suggested to be involved in the biological inactivation of these sex steroids .