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Rhesus enteric caliciviruses are genetically diverse and can be classified into four genetic types within the two genogroups. The dendrogram was constructed by the neighbor-joining clustering method of the MEGA (version 3.1) software with Jukes-Cantor distance calculations. The confidence values of the internal nodes were obtained by performing 1,025 bootstrap analyses. The prototype Tulane virus (M33) isolated in 2004 from the TNPRC rhesus colony is circled.
