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Maximum arthritis scores in (E3.Pia4 × E3.Pia7)F1 intercrossed rats with collagen‐induced arthritis, stratified for Pia7 and Pia4. Significantly more arthritis was induced through carrying 2 DA alleles (b/b) of Cia13/Pia7 (P < 0.05), whereas no effect DA.Cia12/Pia4 was observed. a = E3 allele.
