The major organizing center of the gastrulating embryo is the A. Inner cell mass B. Primitive streak C. Oropharyngeal membrane D. Primitive node E. Paraxial mesoderm The prechordal plate &/or the anterior visceral endoderm plays an important role in regionalization of the A. Notochord B. Embryonic mesoderm C. Forebrain D. Hindbrain E. Primitive node Which Pax is/are important for formation of midbrain? A. Paxl B. Pax3 C. Pax6 D. Pax2 + Pax5 E. Pax2 + Lim-1 or each question in this section, check all correct statements (½ point each line):

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