a, b, C, d, a, B, 27, 28, a, b, C, d, a, b, c, d, abl, b, c, d, a, B, C, d, a, b, cytotrophoblast, synctiotrophoblast, a, b, c, d, a, b, c, d, a, b, c, d, a, b, c, D, a, b, 20, 21, a, b, c, d, abl, b, c, d, a, b, c, d, a, b, c, d, a, b, D, a, b, c, d, a, b, c, d, a, b, c, d, a, b, c, d, a, b, d, a, b, c, d, a, b, C, d

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