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Patent Granted An oocyte (UK /ˈoʊəsʌɪt/, US /ˈoʊ.oʊ.saɪt/), oöcyte, ovocyte, or rarely ocyte, is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature ovum, or egg cell. An oocyte is produced in the ovary during female gametogenesis.