Nuclear resonance vibrational spectroscopy and electron paramagnetic resonance spectroscopy of 57Fe-enriched [FeFe] hydrogenase indicate stepwise assembly of the H-cluster. - Kuchenreuther, J; Guo, Y; Wang, H; Myers, W; George, S; Boyke, C; Yoda, Y; Alp, E; Zhao, J; Britt, R; Swartz, JR; Cramer, S (Biochemistry, 2013)