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Fig. 1. Allele-specific expression of the H19 imprinted gene in individual
blastocysts. Gray bar height indicates the level of maternal expression, while
black bar height represents the level of paternal-specific expression. The
number of Whitten's cultured blastocysts with biallelic expression differed
significantly from that of KSOMaa cultured (P=0.002), in vivo-derived
(P=0.006), and B6XB6(CAST7) Whitten's cultured (P=0.0001)
blastocysts as calculated by Fisher's exact test.