stage 4 neuroblast neuroblast NB4-4 lineage NB4-4 neuroblast lineage 24 neuroblast VFB:FBbt_00001415 fly_anatomy.ontology neuroblast 24 NB 24 neuroblast NB4-4 FBbt:00001415 Neuroblast that delaminates at S4 and generates a motorneuron and several interneurons during the embryonic stage (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 24, composed exclusively of motorneurons. segmentally-repeated neuroblast