Gene family expansions in L. albipes.Two gene families appear to have expanded in the L. albipes lineage. Trees were calculated using maximum-likelihood. (A) Glutathione-S-transferase gene family. Nine homologs of this family were identified in L. albipes (blue branches) in contrast to only four known homologs in A. mellifera (orange branches). (B) Inositol monophosphatase gene family. Seven members of this family are found in the L. albipes genome (blue branches), in contrast to three homologs in A. mellifera (orange branches).