| FREIR | Federal Research on Biological and Health Effects of Ionizing Radiation |
|---|---|
| FRF | Fertility Research Foundation; follicle-stimulating hormone-releasing factor |
| GCRC | General Clinical Research Center [of NIH] |
| GR | gamma-rays; gastric resection; general research; generalized rash; glucocorticoid receptor; glutathi... |
| GRECC | Geriatric Research and Education Clinical Center |