What critical developmental process/es are altered following retinoic acid-exposure, which may cause protrusion of the spinal cord through the vertebral arches? Select one or more: A. Primary neurulation, where the neural plate creases inward until the edges come in contact and fuse. OB. Secondary neurulation, where the tube forms by hollowing out of the interior of a solid precursor. C. Regulation of neural crest migration from the neural tube to generate segmental ganglia. D. Abnormal somite formation affecting the development of muscles of the back.

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