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... Pregnant animals were sacrificed on day 10, 10.5, 11, 11.5, 12.5, 13.5, 14, 14.5 and 17.5 after the
vaginal plug was determined, and embryos were fixed in 4% buffered formalin at 4°C overnight, either in...
http://www.cancerimmunity.org/v6p10/060610.htm