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Chromatid
A chromatid is one of two identical halves of a replicated chromosome. During cell division, the chromosomes first replicate so that each daughter cell receives a complete set of chromosomes. Following DNA replication, the chromosome consists of two identical structures called sister chromatids, which are joined at the centromere. Courtesy: National Human Genome Research Institute

Source: .
http://www.genome.gov/
http://www.genome.gov/
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