Proportions of CD3⁺, CD4⁺ and CD8⁺ T cells within ZCL and SCL lesions. Histograms represent results of the immunohistochemical analysis expressed as a percentage of positively stained cells among mononuclear cells. Results are expressed as the mean plus the standard error of percentage mean. Any significance found is indicated by a bar on top of each graph connecting the two comparisons. p < 0.05 was considered statistically significant.