Composite phenotypes of lipoprotein mutants. (A) Expression, surface exposure and membrane fraction ratio values are plotted for each of the 43 identified mutants, including OspA20:mRFP1 (ED), as well as the OspA28:mRFP1 control are plotted. Data were derived from independent duplicate or triplicate Western immunoblot experiments. Representative data are shown in Figures 4, 5 and 6. Numerical data are listed in Additional File 1-Table S1. Y-axis ranges were 0-100% for expression/stability levels (yellow diamonds) and surface exposure (red triangles), and 0 to 1.0 for the OM/PC ratio (blue squares). Data points with asterisks (*) lay beyond the y-axis ranges (Additional File 1-Table S1). Mutant-specific amino acid sequences are listed in single letter code on the × axis. n indicates the number of times a particular mutant was isolated from the unsorted (pre) and sorted (post) population. Unanalyzed mutants are listed in Additional File 1-Table S1. (B) Boxplots of surface percentage values of the unsorted (pre) and sorted (post) populations. For each dataset, the box outlines the first and third quartiles, the horizontal red line indicates the median, and the vertical lines extend to the minimum and maximum values.