NEW YORK (GenomeWeb) – Researchers have uncovered variability in DNA methylation in pairs of identical twins discordant for rheumatoid arthritis (RA), suggesting epigenetic variability may be a key factor in autoimmune conditions.

RA causes joint pain and swelling, and affects some 1.3 million adults, according to the US National Institutes of Health. The autoimmune condition is thought to be influenced by environmental exposures.

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