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Relatedness of serogroup 6 isolates of S. pneumoniae. A UPGMA tree was constructed from the matrix of pairwise differences in the allelic profiles of the 102 isolates. The serotype of each isolate is shown, followed by the isolate name, ST number, and cps profile. The presence of the indel between the wciN and wciO genes is also indicated. STs that include isolates of both serotypes 6A and 6B are indicated by asterisks.
