= Biorientation
Attachment of sister <kinetochores> toward opposite spindle poles, supporting accurate allocation of <sister chromatids>.
Opposing attachments permit sister <chromatids> to separate toward different poles at anaphase. Mere attachment is insufficient: both sisters can attach incorrectly toward the same pole. Attachment geometry and checkpoint satisfaction therefore require separate evaluation. <Molecular Biology of the Cell, 4th edition by Bruce Alberts and others>[Chapter 18, Chromosome Segregation]{ref}
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