| CFU | Colony-forming units |
| DT | Diphtheria toxin |
| HEK | Human embryonal kidney |
| LD | Linear dichroism |
| LDH | Lactate dehydrogenase |
| NTTB | Non-toxigenic toxin-bearing |
| OD | Optical density |
| SEAP | Secreted alkaline phosphatase |
| TEER | Transepithelial electrical resistance |
| TLA | Three-letter acronym |
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