Sequence analysis of genomic DNA and cDNA for SLC38A4 (A, B), NNAT (C, D), NAP1L5 (E, F), and H19 (G, H) genes. Arrows point to SNP site. A, C, E, and G, sequence analysis of genomic DNA shows heterozygosity at positions 9188, 11761, 1024, and 1889 of SLC38A4, NNAT, NAP1L5, and H19, respectively. B, analysis of cDNA shows biallelic expression of C and T alleles at SNP 9188. D, F, and H, for the imprinted genes NNAT, NAP1L5, and H19, monoallelic expression of alleles T, G, and G, is shown.