= Anaphase
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In mitotic <anaphase>, <sister chromatids> separate into daughter <chromosomes> moving toward opposite poles.
Release of <cohesin>-mediated association permits the sister <centromere> regions to separate. Each former <chromatid> is then counted as an independent daughter <chromosome>. This changes the counting convention without making additional <DNA> copies. For the $2n=4$ example, the whole undivided <biological cell> transiently contains eight daughter <chromosomes>, four moving toward each pole. Movement toward poles and separation of the poles both contribute to partition in the illustrated <animal> setting.<Biology 2e by Mary Ann Clark and others/The Cell Cycle>[Biology 2e by Mary Ann Clark and others; §10.2, Karyokinesis, Figure 10.6 and Anaphase: release of cohesion, daughter chromosomes and spindle elongation]{ref}
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