Figure 1From: Identification of a novel pentatricopeptide repeat subfamily with a C-terminal domain of bacterial origin acquired via ancient horizontal gene transferConserved domain architecture of PPR-TGM proteins. Each protein has a PPR tract consisting of 3–7 PPR motifs and a C-terminal tRNA guanine N-7 methyltransferase domain. Additionally, some PPR-TGM proteins contain N-terminal signal peptides (not shown).Back to article page