The bacteria Proteus, Serratia, Escherichia and Pseudomonas possess sequences resembling the rheumatoid arthritis susceptibility sequence EQRRAA, but antibodies were elevated only to Proteus in 66 RA patients (P<0.001) when compared to 61 active ankylosing spondylitis patients and 60 controls.
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Tiwana et al. (1996) studied this question.
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