Http://: http://www.med.umich.edu/lrc/coursepages/m1/embryology/embryo/06placenta.htm |
Http://: http://en.wikipedia.org/wiki/Placenta |
Http://: http://www.med.umich.edu/lrc/coursepages/m1/embryology/embryo/06placenta.htm |
Http://: http://en.wikipedia.org/wiki/Placenta |