protocerebral neuroblast neuroblast BLD5 neuroblast VPNp1 neuroblast DC FBbt:00100624 neuroblast BLD5 VFB:FBbt_00050249 FBbt:00050249 fly_anatomy.ontology Neuroblast with a relatively posterior position in the BLD group, close to BLD6 (Wong et al., 2013; Hartenstein et al,. 2013). Its secondary lineage forms arbors in the ipsilateral lobula and contralateral medulla, following a characteristic straight commissural tract between these regions (Ito et al., 2013; Yu et al., 2013; Wong et al., 2013). type I neuroblast neuroblast BLD