| ID | Type | Location (GRCh37) | Location (GRCh38) | Length | GC content |
|---|---|---|---|---|---|
| hsa_IPCEF1_0000500 | Exon-Intron | chr6:154480311-154494229 | chr6:154159176-154173095 | 390 nt | 0.4744 |
| hsa_IPCEF1_0001000 | Intron-Exon-Intron | chr6:154506775-154535410 | chr6:154185641-154214276 | 250 nt | 0.3400 |
| hsa_IPCEF1_0001100 | Intron-Exon-Intron | chr6:154517614-154521174 | chr6:154196480-154200040 | 250 nt | 0.3280 |
| hsa_IPCEF1_0003300 | Intron-Exon-Intron | chr6:154542391-154551799 | chr6:154221257-154230665 | 250 nt | 0.3200 |
A study in mice demonstrated that chronic morphine exposure significantly upregulated the circOPRM1 in whole brain, suggesting morphine may facilitate its formation and that it may function as a microRNA sponge [Daws et al. DOI:10.1016/j.mcn.2023.103841].