MKI67 and obesity due to melanocortin 4 receptor deficiency: The quantification of Ki67-positive cell elements showed a significant increase in the number of proliferating cells in lymphoid follicles in obesity (5389 ± 281.8 cells/mm3)—73% higher than in the control group (3115 ± 446.4 cells/mm3) and 135% higher than in the “CTL + OEA-DS” group (2292 ± 494.5 cells/mm3).