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IRA1 and IRA2 haplotypes from flocculent/invasive strains are not closely related. Each panel shows a maximum-likelihood phylogeny inferred from coding sequences of IRA1 (A) or IRA2 (B). Identifiers of strains in which IRA1 or IRA2 underlies flocculent and invasive growth traits are colored purple. Scale bars indicate frequencies of base pair substitutions per site.
