There are two sets of ducts (Wolffian and Mullerian) that either break down or become things like the fallopian tubes, uterus, and upper part of the vagina or the seminal vesicles, vas deferens ...

1 Department of Zoology, Graduate School of Science, Kyoto University, Kyoto, Japan 2 Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan Gut ...