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Hill JA, Southwood S, Sette A, Jevnikar AM, Bell DA, Cairns E: Cutting edge: the conversion of arginine to citrulline allows for a high-affinity peptide interaction with the rheumatoid arthritis-associated HLA-DRB1*0401 MHC class II molecule

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Its unrelated to germs that cause infections, like viruses and bacteria, which means you cant catch it or spread it to someone else

Non-nicotine liquids for e-cigarette devices in Australia: chemistry and health concerns (PDF) - this report describes the chemicals to which people may be exposed from the use of e-cigarettes, and the health concerns about these chemicals