adult Malpighian tubule segment adult upper Malpighian tubule 2020-05-11T14:30:49Z FBbt:00049468 Distal portion of the adult Malpighian tubule comprising the initial, transitional and main segments (Wang and Spradling, 2020). It contains type II (stellate) cells, but no stem cells (Wang and Spradling, 2020). fly_anatomy.ontology