| VDR | vitamin D receptor |
| PTH | parathyroid hormone |
| PTHrP | parathyroid hormone related protein |
| VDRΔ/Δ | mutants with a non-functioning VDR |
| sHPT | secondary hyperparathyroidism |
| BMDD | bone mineralization density distribution |
| qBEI | quantitative backscattered electron imaging |
| OLS | osteocyte lacunae sections |
| RD | rescue diet |
| CD | challenge diet |
| ND | normal diet |