part of develops from neuroblast NB7-1 embryonic ganglion mother cell ventral nerve cord primordium ganglion mother cell GMC7-1f fly_anatomy.ontology ganglion mother cell GMC 7-1f Sixth born ganglion mother cell of neuroblast NB7-1. FBbt:00006040 In the wildtype neuroblast 7-1 lineage, GMC7-1a and GMC7-1b and their progeny are hb (FBgn0001180) and Kr (FBgn0001325) positive. Subsequent GMCs do not express hb (Isshiki et al., 2001). ectodermal derivative