Zebrafish pax[b] is involved in the formation of the midbrain-hindbrain boundary.

Abstract excerpt

Among the genes thought to be involved in patterning the nervous system are a family of developmentally regulated paired box-containing (Pax) genes. Mutations in some of these Pax genes lead to severe developmental abnormalities. Zebrafish pax[b](pax[zf-b]) is a member of the Pax gene family that is expressed in the presumptive posterior midbrain from the end of gastrulation and, at later stages, in other...

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