Seahorses have the unique characteristic of male pregnancy, which includes the carrying of many embryos in a brood pouch that incubates and nourishes the embryos, similar to the mammalian placenta. However, the regulatory networks underlying brood pouch formation and pregnancy remain largely unknown.
Click here for original story, Study reveals how retinoic acid regulates brood pouch formation and pregnancy of male seahorses
Source: Phys.org