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Yl distribution in yolk uptake mutants. In strong yl mutants, which express full-length Yl protein yet fail to take up yolk, the Yl protein does not become cortically localized during the vitellogenic stages. (A) Early stage 9 yl21 oocyte; (B) stage 10 yl21 oocyte; (C) stage 10 yl15 oocyte. (D) Cortical Yl localization also fails to occur in stilWE42 mutant ovaries. Bar, 20 μm.
