Figure 1.

Highly conserved region in eukaryotic and archaeal eRF1s encompassing the GGQ tripeptide common to all class-1 translation termination factors. Positions are numbered for the human eRF1. Accession numbers are given after the names of the species. Numbers in brackets correspond to NCBI-Entrez-Protein database accession numbers. Amino acids in alignment were shaded according to their identity percentage (white letters, black shading, 100%; white letters, dark-grey shading, 80%; black letters, light-grey shading, 70%).