Alignment of symbiotic plasmids of R. grahamii CCGE502 (pRgrCCGE502a) and R. mesoamericanum STM3625 (pRmeSTM3625 2). Numbers indicate nucleotide positions and arrows the open reading frames in each replicon. Red and yellow lines indicate conserved regions with the same direction. Yellow lines show conserved symbiosis regions including nif, fix and nod genes. Blue lines indicate inverted conserved regions.