| MCF | macrophage chemotactic factor; median cleft face; medium corpuscular fragility; microcomplement fixa... |
|---|---|
| OAF | open air factor; osteoclast activating factor |
| OGF | ovarian growth factor; oxygen gain factor |
| OSF | organ system failure; osteoclast-stimulating factor; outer spiral fiber; overgrowth stimulating fact... |
| OTF | octamer-binding transcription factor; oral transfer factor |