Clustal X alignment of ribosomal protein L7a amino acid sequences. The alignment comprises the portion corresponding to positions 135 to 200 in the Saccharomyces cerevisiae protein (full organism names are listed in Table 1). At highly conserved positions at which a single amino acid predominates, residues are indicated as white letters on a black background. The arrowhead denotes the location of a conserved spliceosomal intron. The predicted Giardia lamblia protein sequence either with (above arrowhead) or without (below arrowhead) removal of the intron is shown. Sources of the sequences are: S. cerevisiae [GenBank:AAB65045], Homo sapiens [GenBank:NP_000963], D. melanogaster [GenBank:AAN09172], A. castellanii [GenBank:AY925000], J. libera [GenBank:AY924997], T. pyriformis [GenBank:DQ118092], E. gracilis [GenBank:], H. marismortui [GenBank:YP_134885] and G. lamblia [GenBank:AACB01000019].