| X | Xanthine |
|---|---|
| X | xylitol |
| X-ALD | X linked adrenoleukodystrophy |
| X-CGD | X-linked chronic granulomatous disease |
| X-CT | X-ray computed tomography |
| X-gal | 5-Bromo-4-chloro-3-indolyl-beta-D-galactopyranoside |
| X-IAP | X-linked inhibitor of apoptosis protein |
| X-SA | Cross-sectional area |
| X-SCID | X-linked severe combined immunodeficiency |
| X-XO | Xanthine-xanthine oxidase |