A haplotype map of a portion of chromosome 5 that includes
a gene involved in Crohn's disease. Each of the 11 haplotype
blocks comes in two to four "flavors," represented
by unique combinations of single nucleotide polymorphisms—places
in the genetic code where DNA differs from one person
to the next by a single letter. The dashed lines show
common relationships between the blocks. The percentages
indicate the occurrence of each of the common flavors
found in the patients studied.
