| FADS | fetal akinesia deformation sequence |
|---|---|
| FAV | facio-auriculovertebral [sequence]; feline ataxia virus; floppy aortic valve; fowl adenovirus |
| FRHS | fast-repeating high sequence |
| FRV | full-length retroviral [sequence]; functional residual volume |
| IGS | image-guided surgery; inappropriate gonadotropin secretion; internal guide sequence |
| upstream activation site | A DNA sequence that regulates transcription like an enhancer but does notwork if its located downstream from a promoter. (09 Oct 1997) |
|---|---|
| fragile site | Places on chromosomes that tend to break more often than other places. These places also tend to be where chromosomal translocations (a type of chromosomal mutation) occur. (09 Oct 1997) |
| ligand binding site | The site on a protein's surface that binds a ligand; equivalent to the active site if the ligand is the substrate of an enzyme. (05 Mar 2000) |