Hu S, He B, Wang X, Gao S, Wen G, Lin Y. Stabilization of cytochrome b 5 by a conserved tyrosine in the secondary sphere of heme active site: A spectroscopic and computational study. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 2017 Mar;174():118–23. doi: 10.1016/j.saa.2016.11.032.