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. 2008 Mar 14;4(3):e1000020. doi: 10.1371/journal.ppat.1000020

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Callaghan et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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HV1 and HV2 epitopes are classified into alleles as described in the Materials and Methods section. The colours indicate the total number of observations of each particular combination. Each opa locus is treated independently, so each isolate can contribute more than one combination. (See Text S1 for an alternative representation of the data).