Figure 1

Locations of replication origins mapped on the tobacco chloroplast genome. The figure depicts the relative positions of known replication origins (A1, A2, B and R) and their complementary copies (origin type appended with '-C'), on the circular tobacco chloroplast genome, mapped using SimVector 4.22 http://www.premierbiosoft.com. The six regions between each pair of replication origins are annotated respectively as 1 (between A2 and A1 [A1-C]), 2 (between A1 [A1-C] and R [B-C]/B), 3 (between R [B-C]/B and B/R [B-C]), 4 (between B/R [B-C] and A1), 5 (between A1 and A2) and 6 (between the A2s on either strand).