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From the following article
Plasma placental RNA allelic ratio permits noninvasive prenatal chromosomal aneuploidy detection
Y M Dennis Lo, Nancy B Y Tsui, Rossa W K Chiu, Tze K Lau, Tse N Leung, Macy M S Heung, Ageliki Gerovassili, Yongjie Jin, Kypros H Nicolaides, Charles R Cantor & Chunming Ding
Nature Medicine 13, 218 - 223 (2007) Published online: 7 January 2007
doi:10.1038/nm1530
Figure 1
Schematic of the RNA-SNP allelic ratio strategy for noninvasive detection of fetal trisomy 21 through maternal plasma analysis by the relative quantification of alleles of placenta-expressed transcripts located on chromosome 21.
Full size figure and legend (44 KB)Figure 3
Schematic illustration of the analytical approach for RNA-SNP allelic ratio determination.
Full size figure and legend (46 KB)Figure 5
The relative insensitivity of RNA-SNP ratio analysis to gestational age and placental mosaicism.
Full size figure and legend (54 KB)