Day 243 (10q24.31-10q25.1): an enzyme that handles arsenic


Day 243 has 72 protein-coding genes (browser view) including AS3MT (arsenite methyltransferase).

Humans metabolize arsenic through two methylation reactions; the first is performed by AS3MTc. There may be natural selection for less active versions of this gene in regions with higher arsenic in drinking water.

Click here to see all 8362339 letters of Day 243

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