Abstract

Often, genotyping of mouse embryos is required, and a small part, such as the yolk sac, can be used for this purpose. Here, DNA samples are prepared from extra-embryonic tissues by digestion with Proteinase K and subsequent extraction. The yolk sac of mid-gestation or later-stage embryos provides a sufficient amount of DNA for Southern analysis. Small tissues of a few hundred cells are used for genotyping early postimplantation- and preimplantation-stage embryos by polymerase chain reaction (PCR).

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