part of develops from endoderm posterior endoderm anlage developing embryonic structure stage 7 embryo stage 8 embryo posterior endoderm fly_anatomy.ontology postMGRudP2 postEndoP2 posterior endoderm primordium P2 posterior midgut primordium rudiment PMG FBbt:00005560 FBbt:00005522 posterior midgut rudiment The posterior part of the endoderm from its invagination as part of the amnioproctodeal invagination during stage 7, until it becomes morphologically distinct from the hindgut primordium due to a epithelial-to-mesenchymal transition at the end of stage 10 (Reuter et al., 1993). This epithelial-to-mesenchymal transition is also the transition from posterior endoderm to posterior midgut primordium. P2 postEndo postEndo FBbt:00005525 early extended germ band embryo