| OSR | Oblique Section Reconstruction |
| Tn | Troponin |
| TM | Tropomyosin |
| RLC | Regulatory Light Chain |
| ELC | Essential Light Chain |
| myac | A thin, 25 nm thick longitudinal section containing alternating myosin and actin filaments |
| LMM | Light meromyosin; the last ~100 nm of myosin coiled-coil rod domain |
| MD | Motor Domain |
| IHM | Interacting Heads Motif |
| cryoEM | Cryogenic Electron Microscopy |
| S1 | The component of myosin containing the motor domain, light chains and lever arm |
| S2 | Initial ~50 nm of the myosin coiled-coil rod domain |
| ET | Electron Tomography |
| AMPPNP | adenylyl-imidodiphosphate, a non-hydrolysable analog of ATP |
| HST | High Static Tension, i.e., an isometric contraction |
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