Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
13C double quantum filter- and 15N double cross-polarization–filtered, DNP-enhanced spectra of ChR2 in a sapphire rotor (A) in the dark and (B) after illumination with blue light at 110 K. (C) Optical difference spectrum of ChR2 at 150 K of dark- and blue light-illuminated ChR2 (Δ abs refers to the absorption difference).
