stage 4 neuroblast neuroblast NB2-1 Neuroblast that delaminates at S4 and generates approximately 15 primary local interneurons (Schmid et al., 1999). In the embryo, one of these cells can be found in each hemisegment from S1-A10 (Birkholz et al., 2013; Urbach et al., 2016). In the larva, it resumes proliferation in all thoracic segments (Truman et al., 2016). The neurons that develop from this neuroblast after larval hatching form postembryonic lineage 2 (Lacin and Truman, 2016). neuroblast 2 VFB:FBbt_00001410 fly_anatomy.ontology neuroblast NB2-1 lineage 2 neuroblast FBbt:00001410 lineage NB2-1 neuroblast NB 2 segmentally-repeated neuroblast