Observed concentration and protein detection frequencies. Correlation between the observed protein copy numbers (based on emPAI) and the detection frequency of the identified proteins. Detection frequency is defined as the average ratio of detection of the observed parent ions of a given protein in all performed LCMS experiments. Red dots indicate reference proteins (introduced in Figure 2), black dots indicate ribosomal proteins.
Ishihama et al. BMC Genomics 2008 9:102 doi:10.1186/1471-2164-9-102