| CMV | cytomegalovirus |
| DAB | 3,3′-diaminobenzidine |
| HHV6 | human herpes virus 6 |
| IVig | intravenous immunoglobulin |
| KIR | killer cell Ig-like receptors |
| NCR | natural cytotoxicity receptors |
| MIP-1β | macrophage inflammatory protein 1β |
| NK | natural killer cells |
| uNK | uterine natural killer cells |
| NCAM | neural cell adhesion molecule |
| RIF | recurrent implantation failure |
| RPL | recurrent pregnancy loss |
| RT | room temperature |
| TBST | Tris-buffered saline-Tween20 |
| uRPL | unexplained recurrent pregnancy loss |
| uRPL-CD56high | uRPL subgroup of high uNK cell counts |
| uRPL-CD56low | uRPL subgroup of low uNK cell counts |
| uRPL-CD56normal | uRPL subgroup of normal uNK cell counts |