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Fig. 6. Sister kinetochores are closely associated during metaphase I. (A) Section of a metaphase I spermatocyte. Centromeres (arrowheads) are more contrasted than the condensed chromatin at the arms. A pair of centrioles (Ce) is visible at a cell pole. (B-G) Six serial sections of a metaphase I centromere. Sister kinetochores are not resolved, but a continuous outer kinetochore plate (black arrowheads), where kinetochore microtubules end, is discernible. The inner kinetochore plate is visible in some sections (white arrowhead in B). Scale bars: (A) 3 µm; (B-G) 600 nm.





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