FIG. 6.

Polymorphisms in the sequence alignment plotted against position in the alignment for the entire genome of SV40 (divided into 100-bp intervals). Singletons have been detected only once, confirmed changes have occurred in more than one sequence, and unique INDEL changes represent gaps. The T-ag-C gene region has the highest level of polymorphism. Four other polymorphic regions that can be analyzed by using existing DNA-sequencing primers were identified (Table 2); nucleotide positions (SV40-776 numbering) are shown over those regions.