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Fig. 8. A model for the development of IT and DA neurons. (A)
Regulatory network underlying isotocinergic (IT, purple oval) and dopaminergic
(DA, brown hexagon) neurons in the zebrafish hypothalamus (see text).
Regulation of Otp by the proneural gene product Neurogenin1 (Neurog1) are yet
to be determined (dashed arrow, see Discussion). (B) Expression of
pac1, fezl and otp in either IT neurons that reside in the
neurosecretory preoptic nucleus (NPO) or DA neurons that reside in the
posterior tuberculum (PT) are schematically shown.