| HREM | high-resolution electron microscopy |
|---|---|
| HRSP | high-resolution storage phosphor |
| HRTEM | high-resolution transmission electron microscopy |
| IRS | immunoreactive secretion; infrared spectrophotometry; insulin receptor species; insulin receptor sub... |
| MAR | main admissions room; marasmus; marrow; maximal aggregation ratio; medication administration record;... |