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Figure 1 .
Andreas Vesalius, 1514–1564.
Figure 2 .
Gabriele Fallopius, 1523–1562.
Figure 3 .
Placenta, umbilical cord, liver, and ductus venosus (from Fabricius' De formato foetu (1600)).
Figure 4 .
Heart, lung, great vessels, and ductus arteriosus (E) (from Fabricius' De formato foetu (1600)).