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About Carnegie Stage 13 Most embryos at stage 13 are approximately 28 postovulatory days old and measure 4-6 mm in length. Distinguishing criteria for this stage include the presence of all four limb buds and a closed otic vesicle. The lens disc is generally not yet indented. The specimen depicted here is most likely a late stage 13 embryo (compare to Carnegie embryo No. 7618 as shown in O'Rahilly and Muller's text). |
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