| NCA | National Certification Agency; National Council on Aging; National Council on Alcoholism; neurocircu... |
|---|---|
| NDA | National Dental Association; New Drug Application; no data available; no detectable activity; no det... |
| NGSA | nerve growth stimulating activity |
| NKCA | natural killer cell activity |
| NLA | National Leukemia Association; neuroleptoanesthesia; normal lactase activity |