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. 2013 May 15;8(5):e62259. doi: 10.1371/journal.pone.0062259

Figure 4. Dated phylogenetic tree of the relationship of the two Northern elephant seal isolates (shown in red) relative to other human and non-human pH1N1 isolates, showing the closest isolate was A/San Diego/INS202/2009 in humans.

Figure 4

The estimated time to most recent common ancestor (TMRCA) 95% Bayesian credible intervals are indicated.