The curvature of the crista junctions is due to a protein complex called MICOS (mitochondrial contact site and cristae organizing system).

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The curvature of the crista junctions is due to a protein complex called MICOS (mitochondrial contact site and cristae organizing system).

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Mitotic spindle attach to chromosomes via specialized protein structures known as kinetochores

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Kinetochores assemble on regions of chromosomal DNA marked by a centromere-specific H3 histone variant called CENP-A.

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Amphitelic attachment, 

sister kinetochores attach to microtubules emanating from opposite spindle poles, they are stably attached

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Merotelic attachment 

A kinetochore can attach to microtubules emanating from both poles at the same time

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Syntelic attachment 

Both kinetochores of a sister chromatid pair can attach to microtubules from the same pole

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Monotelic attachment 

only one kinetochore can attach to microtubules