NCIt definition : Antigen KI-67 protein (3256 aa, 359 kDa) is encoded by the human MKI67 gene. This
protein is required for cell proliferation.;
NCIt note : Detection of Antigen KI-67 is used to locate proliferating cells in neoplastic diseases.
(OMIM); Antigen KI-67 protein expression occurs during late G1, S, G2, and M phases of the
cell cycle, while in cells in G0 phase the protein cannot be detected. The protein
is located in the perinucleolar region during G1 phase. In the later phases it is
detected throughout the nuclear interior, predominantly in the nuclear matrix. In
mitosis, it is present on all chromosomes. (SwissProt);