| Abstract: | A library of monoclonal antibodies (MAbs) against Drosophila ovarian antigens was established. Each of the MAbs was characterized by its immunohistochemical binding pattern to sections from egg chambers at various stages of oogenesis. Sixteen of the 18 MAbs were found to bind to antigens in mature oocytes. Among the 16 antigens, two were also located in cytoplasm of cell types in the egg chamber other than the oocyte, at all stages of oogenesis. Four made their appearance in nurse cell cytoplasm at mid-vitellogenic stages and shifted to oocyte cytoplasm at a later stage, and ten appeared at the vitellogenic stage and confined their distribution to oocyte cytoplasm. All these antigens were distributed evenly in cytoplasm of mature oocytes. However, some of these antigens were noticed to change their distribution during early embryogenesis as to be localized in a specific region of embryos. |
