Lymphocytes from 48 IBD patients including nine with HLA-B27 were examined for their capacity to absorb Y.enterocolitica 0:9 antiserum. They possessed a range of absorption ability which was unconnected with HLA-B27 status. Samples of lymphocytes from 28 AS patients, 10 RA patients and 28 normal control subjects were included for comparison. The significance of the findings is discussed.
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