The University of Texas MD Anderson Cancer Center's Andy Futreal and colleagues explore the genetic heterogeneity present in primary melanoma tumors produced in transgenic zebrafish lines that were designed to carry key melanoma mutations in BRAF or NRAS genes but not exposed to harsh ultraviolet light.

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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.