An evolutionarily conserved spliceosomal intron within Rpl7a of representative organisms of the domain Eucarya. Nucleotide sequences at the exon-intron junctions are shown, with the exon sequences in uppercase letters and intron sequences in lowercase. The total length of each intron is shown above the dotted lines. The conventional spliceosomal intronic boundary sequences are bolded (gt...ag). One-letter amino acid abbreviations for the corresponding L7a protein sequences are indicated below the exon sequences. Amino acid position within the L7a protein is indicated at the bottom of the figure and corresponds to the S. cerevisiae sequence, as in Fig. . Sequences from NCBI are: D. discoideum [GenBank:AC116100], D. melanogaster [GenBank:X82782]; H. sapiens [GenBank:X52138]; and G. lamblia [GenBank:AACB01000019]. Sequences determined in the present study are: A. castellanii [GenBank:AY925008]; J. libera [GenBank:AY925006]; T. pyriformis [GenBank:AY925011]; M. californianus [GenBank:AY925003].