Comparison of concentration of A, Pb; B, Cd; C, Cr; D, Ni; E, Na; F, K; G, Ca; H, Mg; J, Cu; K, Zn; L, Fe; M, Mn and N, Co in different genotype carrier of SOD1 gene [rs2070424 (-251A/G)] polymorphism in control and RA patients. S*, Significant (P<0.05); S**, Highly significant (P<0.01); NS, Non-significant (P>0.05).