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Influence of gestational age on the endocervical trophoblast cell frequency. Trophoblast frequencies for individual women with normal intrauterine pregnancy (open circles), ectopic pregnancy (closed diamonds) or blighted ovum (closed triangles) are shown with respect to the gestational age at the time of collection. A linear regression line drawn through the normal intrauterine pregnancy values is shown and had an R2 value of 0.005.
