Figure 6. T and B cell proliferation in the pituitary gland of human autoimmune hypophysitis.

Pituitary sections of human hypophysitis patients were immunostained by secondary antibody (blank control, (a)) or by Ki-67 (in red) and CD3 (in brown, (b)) or CD20 (in brown, (c)). Proliferating cells are indicated by arrows. Note a cluster of B cells that were stained positive for Ki-67 (thick arrows) in (c).