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ι-Crystallins in the phylogenetic tree of the CRBPs. This neighbor-joining tree (27) is constructed from the aligned protein sequences in Fig. 1 by using a Tajima-Nei distance matrix (28) and midpoint rooting. Unassigned positions in Gonatodes ι-crystallin are introduced as missing data. Bootstrap scores are based on 1,000 replicates. Branch lengths are proportional to the number of amino acid replacements.
