| A [band] | the dark-staining zone of a striated muscle |
|---|---|
| AgNOR | silver-staining nucleolar organizer region |
| FAST | flow-assisted, short-term [balloon catheter]; fluorescent antibody staining technique; fluoro-allerg... |
| FS | factor of safety; Fanconi syndrome; Felty syndrome; fibromyalgia syndrome; field stimulation; Fisher... |
| HSR | Harleco synthetic resin; heated serum reagin; homogeneously staining region |