| NKCF | natural killer cytotoxic factor |
|---|---|
| NKSF | natural killer cell stimulatory factor |
| NKTR | natural killer triggering receptor |
| NS | natural science; Neosporin; nephrosclerosis; nephrotic syndrome; nervous system; neurological surger... |
| NTA | natural thymocytotoxic autoantibody; nitrilotriacetic acid; Nurse Training Act |