Figure 2.

(A) The distribution of entries by species. (B) A histogram displaying how many modified proteins were identified per publication. The publications identifying the highest number of proteins are proteomics studies utilizing mass spectrometry. (C) Only 79 proteins were overlapped between 10 large mass spectrometry proteomics analyses (blue) and the remaining 449 studies (purple) included in the database. The relative lack of overlap indicates that current proteomics approaches have yet to reach saturation in identifying ADP-ribosylated substrates. (D) A representation of the number of times a specific protein is identified. The majority of proteins are only identified by one publication. However, 18 proteins were identified at least 10 times and are listed in Table 1.