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"(Medical Xpress)\u2014Scientists have long recognized retinoic acid \u2013 a compound the body produces by metabolizing vitamin A \u2013 as crucial to embryonic development. Either too much or too little retinoic acid during gestation can lead to a number of severe postnatal complications and diseases. Consequently, much research has been done on how the body regulates the metabolism of vitamin A, though no clear consensus has emerged."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2013-09-enzyme-crucial-embryonic.html>