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Use "unfertilised" in a sentence
"I think that in princible, even this much could be avoided by substituting an unfertilised egg as a mitrocondria donor."
"If they can make it work using an unfertilised egg, then they should be able to get the death count even by pro-life standards down to zero."
"It was back in May 2001, when the twin towers were still standing proud and tall and Tadpole was nothing more than an unfertilised egg in my ovaries."