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Purifying selection of UBL4A and UBL4B in various organisms. The phylogenetic tree based on entire coding nucleotide sequences of UBL4A and UBL4B in various organisms. The number on the branch shows the ω value. The ω values refer to the non-synonymous substitution per non-synonymous site (dN)/synonymous substitution per synonymous site (dS). The bootstrap confidence values of nodes are also displayed.
