Effect of immunization with band 3 peptide 861-874 on NZB disease. Comparison of number of IgG molecules of each isotype present on RBCs (A) and the hematocrit (B) of individual NZB mice that were injected with saline (n = 11) or peptide 861-874 (n = 9) (^*P < .01, ^**P < .001, Mann-Whitney U test).