| Strain | Pseudomonas putida KT2440 |
| GI | 26991132 |
| Locus Tag | PP_4446 |
| Description | group II intron-encoding maturase |
| Strain | Pseudomonas denitrificans ATCC 13867 |
| GI | 472323678 |
| Locus Tag | H681_02510 |
| Description | RNA-directed DNA polymerase |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83646665 |
| Locus Tag | HCH_03956 |
| Description | retron-type reverse transcriptase |