Fig. 3
tRNA gene organization and gene synteny. a Mapping of the 57 tRNA genes in MmucT. Blue boxes and arrows mark tRNA genes that are transcribed from the leading (+) strand, while red marks those that are transcribed from the lagging (-) strand. Numbers given in parenthesis indicate the numbers of nucleotides separating two tRNA genes. For orientation, we also marked the 40 predicted "transcriptional units", 1 to 40. b Gene synteny for "transcription units" 11 and 12, see (a), for selected mycobacteria carrying these tRNA genes. The tRNA genes are marked in green except the tRNAIleTAT gene, which is marked in red. The vertical boxes marked in brown highlight homologous genes. Note the presence of the HNH endonuclease gene located between the two tRNA gene clusters (see main text). Generation of gene synteny plots, see http://genoplotr.r-forge.r-project.org/