part of epithelial cell adult midgut cell of proventriculus adult proventriculus epithelial cell adult midgut epithelial cell adult proventriculus epithelial zone 6 adult proventriculus zone 6 epithelial cell 2024-06-21T10:23:00Z Epithelial cell of the sixth zone of the adult proventriculus epithelium (King, 1988). These are cuboidal cells characterized by short, straight, closely packed microvilli and an irregularly infolded basal membrane. They secrete the fourth layer of the peritrophic membrane, as well as digestive enzymes (Zhu et al., 2024). There are approximately 700 of these cells in the adult proventriculus. PV6 cell fly_anatomy.ontology FBbt:00059337