Identification of EF1 family proteins in Giardia. Alignment of members of the EF1 family from G. lamblia (G.l.) and S. cerevisiae (S.c.). Important regions required for RNA binding are underlined. Dark gray represents amino acid identity while the light gray represents amino acid similarity. The GTPase domains common to members of the family are underlined. The Hbs1 and eRF3 homologs are on average twice as similar to each other than they are to Ski7.