Crystal Polymorphism of GB1 Examined by Solid-State NMR Spectroscopy and X-ray Diffraction - Frericks-Schmidt, Heather L.; Sperling, Lindsay J.; Gao, YiGui; Wylie, Benjamin J.; Boettcher, John M.; Wilson, Scott R.; Rienstra, Chad M. (Biological Magnetic Resonance Bank, 2007)