passages.id: split_4_test_766_passage
passages.type: progene_text
passages.text: Comparison of the aldehyde reductase gene structure to all other characterized human genes of the aldo - keto reductase superfamily ( aldose reductase , bile acid binder , and type I and type II 3alpha-hydroxysteroid dehydrogenases ) indicates that it is more distantly related to these genes than they are among themselves .