expresses svp embryonic cardioblast embryonic ostial cardioblast 2024-10-15T13:51:00Z FBbt:00053291 fly_anatomy.ontology Embryonic cardioblast that will become an ostial cell (Molina and Cripps, 2001). There are two of these cells in each of hemisegments A1-A7, found near the posterior segment boundary, and they can be recognized by their expression of seven up (Molina and Cripps, 2001; Lehmacher et al., 2012; Chen et al., 2016).