CD4 and nephritis: There was no significant difference in the population of CD4+CD25+FoxP3+ cells in the spleen between the study groups (4.64%±0.11% vs. 4.82%±0.15% vs. 4.43%±0.05%, NS; WKY-HBSS rats vs. WKY-MSC rats vs. WKY rats without nephritis).