Kappa light chains are polypeptide chains located in cell membrane and cytoplasmic regions of normal B cells and plasma cells. This antibody is reportedly useful in identification of leukemias, plasmacytomas, and other B-cell non- Hodgkin's lymphomas.
Ki-67 is expressed in the proliferating cells preferentially during late G1-, S-, M-, and G2- phases of the cell cycle, while cells in the G0 (quiescent) phase are negative for this protein.