"a prenatal test to detect birth defects at an early stage of pregnancy; tissue from the chorionic villi is assayed"@en-us . . "105410305"@en-us . . . . "chorionic villus biopsy"@en-us . . . "105742962"^^ . "chorionic villus sampling"^^ . . . . "chorionic villus sampling"@en-us . "05742962-n"^^ . "0"^^ . "0"^^ . . "104431705"@en-us .