Extended Data Fig. 4: Gm.phyA(PG)-PCB 2.1 Å structure (PDB 6TC7) of subunit B including side chains and hydrogen bonding network.
From: Structural insights into photoactivation and signalling in plant phytochromes

Note that the weak (3.1 Å) D-ring carbonyl – H370 hydrogen bond in subunit B is somewhat stronger (3.0 Å) in subunit A. PCB (cyan), PAS (slate), GAF (gold), PCB (cyan), waters (red spheres). PW, pyrrole water.