Distribution of PMID re-use amongst interaction records. Distinct interactions are binned according to "lowest pmid re-use" (lpr). Bars indicate the number of distinct interactions (RIG's) with a given lpr. The body contains a long distribution of interactions with lpr values between 25 and 2050 (omitted and indicated by the vertical line). Not all lpr bins are represented after lpr of 25. The bins of interactions at lpr 11781 and 36744 (arrows) correspond to yeast two-hybrid studies of the Campylobacter jejuni  and Drosophila melanogaster  interactomes respectively.