Fig. 23-13 The fetal and postnatal circulation. The differences in shading represent differences in oxygenation of the blood: the vessels with the darkest shading contain the least-oxygenated blood.
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Fig. 23-13 The fetal and postnatal circulation. The differences in shading represent differences in oxygenation of the blood: the vessels with the darkest shading contain the least-oxygenated blood.