Abstract
Mitotin is a nuclear protein detectable in all proliferating cells investigated so far, including human and plant cells. In interphase cells the protein is localized mainly in the nucleoplasm. In G2/M phase it displays a characteristic redistribution and a marked increase which initiated the name mitotin. This study presents the precise localization of mitotin in cytoplasmic structures in two cell types, the potoroo rat kangaroo PtK2 cell and the human lung cancer EPLC 65 cell. In addition to its nuclear localization the antigen is detectable in centrosomes, in the poles of the mitotic spindle, and along spindle fibers. During the last mitotic stages, cytokinesis and reconstitution of nuclei, mitotin displays a rapid decrease and another redistribution. A significant amount of the antigen is retained in the bridge connecting the dividing cells, the midbody.
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