|ZFIN ID: ZDB-IMAGE-130418-3|
Branch lengths are scaled to the expected number of substitutions per nucleotide, and branch colours indicate the strength of selection (dN/dS or ω). Red, positive or diversifying selection (ω>5); blue, purifying selection (ω = 0); yellow, neutral evolution (ω = 1). Thick branches indicate statistical support for evolution under episodic diversifying selection. The proportion of each colour represents the fraction of the sequence undergoing the corresponding class of selection.
|Acknowledgments:||ZFIN wishes to thank the journal for permission to reproduce figures from this article. Please note that this material may be protected by copyright.|