stage 4 neuroblast segmentally-repeated neuroblast neuroblast NB5-7 2017-01-26T18:29:32Z VFB:FBbt_00111737 lineage 20 neuroblast Birkholz et al. (2015) suggest that NB5-4 generates postembryonic lineage 20; Lacin and Truman (2016) identify neuroblast NB5-7 and provide lineage tracing data showing that it generates lineage 20. NB5-7 may have evolved as a duplication of NB5-4 (Lacin and Truman, 2016). NB 20 FBbt:00111737 neuroblast NB5-7 fly_anatomy.ontology lineage NB5-7 neuroblast Neuroblast that is located medial to NB5-4 in the embryo, but does not generate any embryonic progeny (Lacin and Truman, 2016). It proliferates during the larval stage in all thoracic segments to generate postembryonic lineage 20 (Lacin and Truman, 2016). These cells are only found in thoracic segments (Lacin and Truman, 2016). neuroblast 20