Figure 1

Families of GTAG repeats. The consensus sequences of GTAG-1 to GTAG-24 repeat families are reported. Families present in more than one species are boxed. Only the species, order and phyla are indicated (alpha to epsilon refer to Proteobacteria subdivisions). The complete names of the strains analyzed, and the NCBI accession numbers of the genomes are in Additional file 6. Loop sequences common to GTAG-3 and GTAG-14 elements from different species are boxed. Residues not present in all family members are in parentheses. Complementary nucleotide changes are indicated according to the NC-IUB codes (R=A,G; Y=C,T; K= G,T; M=A,C; S=G,C; W=A,T; B=C,G,T; H=A,C,T; V=A,C,G). Non complementary stem residues are in lowercase letters. Gray numbers to the right refer to single elements (S), dimers (D: HH, TT or HT types; see text) or grouped elements (G) in each family. Elements featuring alternative stem and loop sequences in G. uraniireducens GTA-11 and A. vinelandii GTAG-24 have been separately reported, but counted together (boxed gray numbers).