Substituting threonine 187 with alanine in p27Kip1 prevents pituitary tumorigenesis by two-hit loss of Rb1 and enhances humoral immunity in old age - Zhao, H; Bauzon, F; Bi, E; Yu, J J; Fu, H; Lu, Z; Cui, J; Jeon, H; Zang, X; Ye, B H; Zhu, L (J Biol Chem, 2015)