proliferative ki-67

http://en.wikipedia.org/wiki/Ki-67_(protein)

The Ki-67 protein (also known as MKI67) is a cellular marker for proliferation.^[5] It is strictly associated with cell proliferation. During interphase, the Ki-67 antigen can be exclusively detected within the cell nucleus, whereas in mitosis most of the protein is relocated to the surface of the chromosomes. Ki-67 protein is present during all active phases of the cell cycle (G₁, S, G₂, and mitosis), but is absent from resting cells (G₀).