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Morphology of the embryo on GD 9.5. HE stain. AC, amniotic cavity; Al, allantois; Am, amnion; Ch, chorionic plate; EcC, ectoplacental cone; Em, embryo; ExC, exocoelomic cavity; PDZ, primary decidual zone; PG, primary trophoblastic giant cell; RM, Reichert’s membrane; SDZ, secondary decidual zone; YS, yolk sac.
