part of adult Malpighian tubule principal cell Malpighian tubule Type I cell adult stem cell zone of Malpighian tubule adult Malpighian tubule principal cell of stem cell zone 2020-05-12T08:57:16Z fly_anatomy.ontology adult Malpighian tubule Type I cell of stem cell zone FBbt:00049481 adult renalcyte Principal cell of the adult Malpighian tubule that is found in the stem cell zone (ureter and lower tubule) (Wang and Spradling, 2020). Cells of the lower ureter are smaller and less polyploid than more distal cells in this region (Wang and Spradling, 2020). adult Malpighian tubule PC of stem cell zone adult RC