| FRAC | Food Research and Action Center |
|---|---|
| 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... |