Percentage B6 allele in maternal B6 cDNA, maternal B6 gDNA, paternal B6cDNA, and paternal B6 gDNA samples. Graphs show the average percentage of the B6 allele in samples with the standard deviation indicated as error bars. Grb10 (panel A) and Impact (panel B) are known imprinted genes and show very low expression of the B6 allele when it is inherited from the mother (red bar) and very high expression of the B6 allele when it is inherited from the father (blue bar), indicating that these genes are expressed from the paternal allele. The B6 allele makes up approximately 50% of the F1 genomic DNA when the B6 allele is inherited from the mother (red checked bar) or from the father (blue checked bar) as expected. Camk2b (panel C) is expressed less from the B6 allele, whereas Asb3 (panel D), Trp53 (panel E), and Nf1 (panel F) are expressed more from the B6 allele.