part of develops from expresses Fas3 zfh1 Wnt4 germarium follicle stem cell FSC SSC epithelial follicle stem cell Can be identified by expression of zfh1, Fas3 and low expression of Wnt4 (Rust et al., 2020). CL:0000441 Stem cell from which the follicle cells that envelop the germline cyst derive. They develop from the larval follicle stem cell progenitors (Slaidina et al., 2020). There are two follicle stem cells in each germarium, located at opposite sides of the lateral wall of the germarium, in between regions 2a and 2b (Reilein et al., 2017). Each follicle stem cell produces over 500 follicle cells from nine cell divisions (Airoldi et al., 2011). FBbt:00004903 somatic stem cell fly_anatomy.ontology gonadal somatic stem cell somatic cell of ovariole larval follicle stem cell progenitor