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About Carnegie Stage 20 Most embryos at stage 20 are approximately 50-51 postovulatory days old and measure 21-23 mm in length. Distinguishing criteria for this stage include upper limbs slightly bent at the elbows, short stubby fingers, hands curving over the cardiac region but still far apart from each other, and a fringe-like vascular plexus that marks growth centers laterally in the superficial tissues of the head. |
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