Track Description:
Haplotype blocks derived from common SNPs on Chromosome 21 by
Perlegen as described in
"Common High-Resolution Haplotypes." Patil, N. et. al. Science
294:1719-1723 (2001)
[Science].
The location of each haplotype block is represented by
a blue horizontal line with tall vertical blue bars at the first and
last SNPs of the block. Blocks are displayed as starting at the first
SNP and ending at the last SNP of the block. This display is slightly
different from the Perlegen web site where blocks are stretched until
they abut each other. They define haplotype block boundaries as
the midpoint between the last SNP of one block, and the first SNP of the next block.
The shade of the blue indicates the minimum
number of SNP's required to discriminate between haplotype patterns
that account for at least 80% of genotyped chromosomes, darker
colors indicate fewer SNPs are necessary. Individual SNPs are denoted
by smaller black vertical bars. At multi-megabase resolution in dense
mode clusters of tall blue bars may indicate hotspots for
recombination. More information is available for the individual block
selected at the "Outside Link" above and general information on the
blocks is available at Perlegen's main haplotype map page
http://www.perlegen.com/haplotype/