| Fd | the amino-terminal portion of the heavy chain of an immunoglobulin molecule; ferredoxin |
|---|---|
| FSHB | follicle-stimulating hormone, beta chain |
| FTH | ferritin heavy chain; fracture threshold |
| FTL | ferritin light chain |
| HBB | hemoglobin beta-chain; hospital blood bank; hydroxybenzyl benzimidazole |