Embryology Study Offers Clues To Birth Defects

Embryologists have clarified the role that retinoic acid plays in limb development. A new study showed that retinoic acid controls the development (or budding) of forelimbs, but not hindlimbs, and that retinoic acid is not responsible for patterning (or differentiation of the parts) of limbs. This research corrects longstanding misconceptions about limb development and provides new insights into congenital limb defects.