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Average number of spots on two-dimensional immunoblots recognized by natural IgM in sera from the DBA/2J, C57BL/6J and BALB/c female mice. No significant differences in recognition spot numbers were observed among the C57BL/6J and DBA/2J strains (P=0.9567). However, significant differences in recognition spot numbers were observed among the BALB/c and DBA/2J strains (P=0.017) and the BALB/c and C57BL/6J strains (P=0.0053). IgM, immunoglobulin M. *P<0.05.
