Table 2. The genes with introns in the Salvia miltiorrhiza chloroplast genome and the length of the exons and introns.
| Gene | Location | Exon I (bp) | Intron I (bp) | Exon II (bp) | Intron II (bp) | Exon III (bp) |
| atpF | LSC | 144 | 699 | 411 | ||
| clpP | LSC | 71 | 692 | 292 | 628 | 228 |
| ndhA | SSC | 553 | 985 | 539 | ||
| ndhB | IR | 777 | 675 | 756 | ||
| petB | LSC | 6 | 702 | 642 | ||
| petD | LSC | 8 | 720 | 475 | ||
| rpl16 | LSC | 9 | 873 | 399 | ||
| rpl2 | IR | 391 | 658 | 434 | ||
| rpoC1 | LSC | 456 | 759 | 1620 | ||
| rps12* | LSC | 114 | - | 232 | 526 | 26 |
| rps16 | LSC | 42 | 874 | 195 | ||
| trnA-UGC | IR | 38 | 795 | 35 | ||
| trnG-UCC | LSC | 23 | 682 | 48 | ||
| trnI-GAU | IR | 37 | 940 | 35 | ||
| trnK-UUU | LSC | 37 | 2522 | 35 | ||
| trnL-UAA | LSC | 37 | 453 | 50 | ||
| trnV-UAC | LSC | 36 | 576 | 37 | ||
| ycf3 | LSC | 129 | 696 | 228 | 726 | 153 |
The rps12 is a trans-spliced gene with the 5′ end located in the LSC region and the duplicated 3′ end in the IR regions.