This Week in Science

In this week's Science, researchers from the Karolinska Institute report the results of an analysis of genome-wide allelic expression patterns in individual cells of mouse preimplantation embryos. They found "abundant" monoallelic expression of autosomal genes and that the expression of the two alleles occurs independently.

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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.