This Week in Science

In Science this week, a team led by researchers at University of Massachusetts Medical School shows that in the mammalian genome, genome-wide demethylation followed by de novo methylation initiates "a pattern inherited throughout development and modified only at tissue-specific loci." The UMass Med-led team reports on its in vivo investigation of methylation in differentiating mouse erythroblasts using reduced representation bisulfite sequencing.

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CNN reports that researchers have tied a new variant to opioid addiction risk.

Organoids derived from patients' tumors may help determine what chemotherapy treatment patients would benefit from, according to New Scientist.

An initiative from GenomeAsia 100K hopes to increase the number of South Asians in genetic research, according to NBC News.

In Science this week: genomic analysis of ancient and modern horses indicates population turnover, and more.