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tag sems genetics genomics

Landmarks of Human Variations
Maria Anderson | May 9, 2004 | 5 min read
BUILDING BLOCKS:© 2001 AAASAlong a 106-kilobase stretch of human chromosome 21, one study found that 18 haplotype blocks represent a segment of 147 SNPs from 20 individual copies of the chromosome. One block, containing 26 SNPs and spanning 19 kilobases, is detailed at right. The four most common haplotypes, occurring in 16 of the 20 chromosomes sampled, can be identified by two tag SNPs (bottom right). (Adapted from N. Patil, Science, 294:1719–23, 2001)The myriad medical breakthrough

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