stage 3 neuroblast neuroblast NB3-1 neuroblast NB3-1 lineage 4 neuroblast lineage NB3-1 neuroblast NB 4 fly_anatomy.ontology FBbt:00001394 VFB:FBbt_00001394 neuroblast 4 Neuroblast that delaminates at S3 in the medial column of neuroblasts and generates the RP1, RP3, RP4 and RP5 motorneurons, as well as several interneurons (Schmid et al., 1999). In the embryo, one of these cells can be found in each hemisegment from S1-A9 (Birkholz et al., 2013; Urbach et al., 2016). In the larva, it resumes proliferation in all thoracic segments (Lacin and Truman, 2016). The neurons that develop from this neuroblast after larval hatching form postembryonic lineage 4 (Lacin and Truman, 2016). segmentally-repeated neuroblast