Comparison of reported structures from electron microscopy of TRP channels and other membrane proteins. Negative stain structures, resolution: Prestin, 20 Å (Mio et al., 2008a); CFTR, 20 Å (Mio et al., 2008b); TRPM2, 37 Å (Maruyama et al., 2007); TRPC3, (Mio et al., 2005). Cryo–electron microscopy structures: Na channel, 19 Å (Sato et al., 2004); InsP₃ receptor, 20 Å (Sato et al., 2004); TRPC3, 15.3 Å (Mio et al., 2007); TRPV1, 19 Å (Moiseenkova-Bell et al., 2008). Fourier shell correlation >0.5 is used as the resolution criterion for electron microscopy structures. X-ray structure: Kv2.1-1.2, 2.4 Å (Long et al., 2007).