part of individualization stage spermatid multi-cell-component structure male-specific anatomical entity cystic bulge Individualisation of spermatids takes place within this bulge - a membrane-cytoskeletal complex that resolves the shared membrane of the spermatid bundle into individual membranes encasing each spermatid and which progresses along the entire length of the spermatid bundle, from head to tail. fly_anatomy.ontology individualization complex FBbt:10005989