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The molecular karyotype of a series of Giardia lamblia isolates representing the two major genotypes (Groups 1 and 3) was generated by assigning 13 genetic markers to chromosomes separated by pulsed-field gel electrophoresis. The co-localization identified five linked groups of genetic markers in Group 1 isolates. For each of the five linkage groups, there were up to four size variants that hybridized...