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oocyte

^ http://purl.obolibrary.org/obo/XAO_0000256


The developing female gamete, the differentiation of which is classified into six stages: I (pre-vitellogenic), II (early vitellogenic), III (mid-vitellogenic, formation of pigment), IV (polarization along animal-vegetal axis), V (late vitellogenic), and VI (post-vitellogenic, appearance of equatorial band). [ http://www.ncbi.nlm.nih.gov/pubmed/4109871 ]