egg chamber UBERON:0003199 fly_anatomy.ontology germarium derived egg chamber FBbt:00004894 Female germline cyst that forms as the 16-cell cyst moves posteriorly through the germarium, becoming encapsulated in follicle cells (Spradling, 1993). Its formation is completed in germarium region 3, where it buds off from the germarium and progresses posteriorly along the ovariole (Spradling, 1993, Reichmann and Ephrussi, 2001). follicle female germline cyst