Frequency distribution of the GRAVY of the theoretical proteins (open bars) and of 110 genes encoding proteins identified on a 2-D electrophoresis gel, pH 4–7 (black bars), in L. casei Zhang. Frequency distribution of the GRAVY of the theoretical proteins (open bars) and of 110 genes encoding proteins identified on a 2-D electrophoresis gel, pH 4–7 (black bars), in L. casei Zhang. Rina Wu et al. Mol Cell Proteomics 2009;8:2321-2338 © 2009 by The American Society for Biochemistry and Molecular Biology, Inc.