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Validation of putative imprinted genes (maternally expressed) using ram and fetal DNA as well as fetal cDNA: CASD1, COPG2, PPP1R9A, and SLC22A18. Red arrows: locations of the informative SNPs. All SNPs were confirmed homozygous in rams and heterozygous in fetuses. Gene expression in cDNA of fetal tissues were allelically biased.
