Rezk, SA; Olvera, M; Harris, S; Koo, C; McCourty, A; Rezk, S; et al.(2001). Immunohistochemical expression of cell cycle proteins E2F-1, CDK-2, cyclin E, P27, and Ki-67 in normal placenta and gestational trophoblastic disease. Mod Pathol, 14. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/6g65b856