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Immunostaining for Ki-67 antigen in pituitary adenoma samples. (A) Null cell adenoma (0% Ki-67 expression); (B) Prolactin (PRL)-secreting adenoma with 4.3% of Ki-67 expression; (C) PRL-secreting adenoma with 4.5% expression of Ki-67; (D) PRL-secreting adenoma with 6.6% expression of Ki-67.
