| ORCC | outwardly rectifying Cl(-) channels |
|---|---|
| ORCC | outwardly rectifying chloride channel |
| Orch | Orchidectomized |
| ORD | Optical rotatory dispersion |
| ORD | Outer-ring deiodination |
| ORF | Open Reading Frame |
| ORF 1 | ORF |
| ORF 2 | ORF |
| ORF 2 | open reading frame |
| ORF 2 | open reading frame 2 |