testosterone 16-beta-hydroxylase activity
Catalysis of the reaction: O2 + reduced [NADPH--hemoprotein reductase] + testosterone = 16beta,17beta-dihydroxyandrost-4-en-3-one + H+ + H2O + oxidized [NADPH--hemoprotein reductase].
GO:0008395
steroid hydroxylase activity
is_a