Assertion: chromatid's centromere | /r/AtLocation | the middle of the chromosome
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Source sentences:
text: Before this happens, every chromosome is copied once (S phase), and the copy is joined to the original by a centromere, resulting either in an X-shaped structure (pictured here) if the centromere is located in the middle of the chromosome or a two-arm structure if the centromere is located near one of the ends.