overlaps embryonic deutocerebrum embryonic tritocerebrum supraesophageal embryonic fiber tract founder cluster deutero/tritocerebral embryonic fiber tract founder cluster Nassif et al. (1998) use Fas2 (FBgn0000635) immunolabelling to visualize the founder clusters. FBbt:00001617 VFB:FBbt_00001617 D/T cluster Embryonic fiber tract founder cluster that overlaps with parts of the deutocerebrum as well as of the tritocerebral neurectoderm. It is located ventral to the protocerebral embryonic fiber tract founder cluster. fly_anatomy.ontology