Figure 1.

Experimental THz spectrum of dark-state rhodopsin in the unbound state (black line) and when bound with Ce6 (purple line) in the (A) 240–100 cm⁻¹ spectral region and in the (B) 100–20 cm⁻¹, spectral region. Experimental THz spectrum of Meta-II in the unbound state (black line) and when bound with Ce6 (purple line) in the (C) 240–100 cm⁻¹ spectral region and in the (D) 100–20 cm⁻¹ spectral region.