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(a) To confirm our earlier observation that the phenotype HLA-DR4,7 occurs with higher frequency in male patients with rheumatoid arthritis (RA) than in female patients. (b) To test the hypothesis that DR7 is associated with low normal serum testosterone (Te) levels in healthy males; this might explain the increased frequency of DR4,7 in male patients since there appears to be a relationship between low serum Te and RA. (c) To characterize the association between HLA alleles and serum Te concentration in healthy males.

Major histocompatibility complex phenotypes influence serum testosterone concentration