OBO_REL:part_of (UNDECLARED) diencephalon ventro-rostral cluster Early-forming neural cluster located in the rostral diencephalon. At 19 h, axons arising from the vrc grow caudally to pioneer the tract of the postoptic commissure (TPOC). Ross et al., 1992. TAO:0007002 teleost_anatomy ventrorostral cluster vrc