Physicochemical differences between anammoxosomal and cell envelope proteins. Two physicochemical parameters are plotted against each other: GRAVY index (grand average of hydropathy) and aliphatic index (relative volume occupied by aliphatic side chains of I, L, V, and A), which can both be calculated from amino acid compositions. These two parameters separate sets A and P into two largely distinct clusters. Purple dots: set P. Blue dots: set A.
Medema et al. BMC Genomics 2010 11:299 doi:10.1186/1471-2164-11-299