Scientists have long suspected that autoimmune diseases such as rheumatoid arthritis (RA) result from a combination of genetic and environmental factors. Now, with partial funding from the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), a research team working to understand the genetic aspect of RA has identified one culprit: a specific genetic variation, called a single nucleotide polymorphism (SNP), that increases RA risk twofold.
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