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. Author manuscript; available in PMC: 2021 Jul 1.
Published in final edited form as: Contraception. 2020 Mar 3;102(1):1–6. doi: 10.1016/j.contraception.2020.02.011

Fig. 1: Titration of cord blood cells into nulliparous adult RBCs.

Fig. 1:

(a) Gates for detection of adult RBCs, fetal RBCs (fRBCs) and maternal F cells (MFCs). The ratio of adult blood to cord blood was 10,000:1. (b) Titration of cord blood (fetal RBCs) into adult RBCs. The measured fraction of fetal RBCs, which stain for fetal hemoglobin (HgbF+) and do not stain for carbonic anhydrase (CA-) is plotted versus the fraction of cord blood in the sample. The relationship between the observed and expected fetal RBC frequency was linear at 0.1–0.00001 (r2 = 0.995). Similar results were obtained in a second experiment (data not shown).