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HCP-6 is required for normal mitotic chromosome condensation in C. elegans. Shown here is an immunofluorescence analysis of a wild-type metaphase plate taken from a 4-cell C. elegans embryo, using antibodies directed against the centromeric histone HCP-3 (pink) and DAPI (blue). Viewed from the centrosomal perspective, immunostaining reveals distinct lines of centromere staining, corresponding to sister centromeres on the twelve mitotic chromosomes (blue). A similar, opposing set of sister centromeres lies below the plane of the page. Chromosomes in the hcp-6 mutant twist around the long axis of the chromosome, allowing single sister centromeres to be captured by microtubules from both poles. (For details, see Stear and Roth, p. 1498.)