Additional file 4.
Figure S4. The relationship between estimated cff-DNA concentration and gestational week. The black dots represent the cff-DNA concentrations (y-axis) plotted against the corresponding gestational week (x-axis) for the 443 samples with male fetuses.
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Jiang et al. BMC Medical Genomics 2012 5:57 doi:10.1186/1755-8794-5-57