Immunoglobulin Genomics in the Guinea Pig Figure 7. Phylogenetic analysis of 94 guinea pig VH genes. A phylogenetic tree of nucleotide sequences of 94 guinea pig potentially functional VH segments was constructed. The three identified VH gene families are labeled with Arabic numerals. doi:10.1371/journal.pone.0039298.g007 PLoS ONE | www.plosone.org 7 June 2012 | Volume 7 | Issue 6 | e39298