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Nanoparticles linked to rheumatoid arthritis - Breathing in nanoparticles could cause rheumatoid arthritis and other serious autoimmune diseases, a new study suggests. Three types of nanoparticles were found to ramp up protein citrullination in cell cultures, a change that can make the body think native proteins are foreign. This process has previously been linked to autoimmune disease. Reference: B M Mohamed et al, Nanomedicine, 2012, DOI:10.2217/nnm.11.177