Fig. 7.

X. laevis embryos at NF stage 26 immunostained with antibody anti-CRABP (C-D'). Magnification: 25X, 40 × .

A, A’: X. laevis control embryo. Note the immunostained areas at the level of the oral cavity (o), of the frontal region (§), of the otic vesicle (>), of the optic vesicle (*), and at the level of the branchial arches with separate neural crest migratory flows (>>).

B, B': X. laevis embryos exposed to NANO-β carotene 30 ng/mL. Note the altered migration of the neural crest cells: the migration streams appear fused forming a ventrally indistinct immunostained mass with fusion regions (<<).