Comparison of the abundance of proteins in the soluble fraction between diseases identified no protein differences in CBD versus PiD, 24 protein differences in CBD versus PSP and 35 protein differences in PiD versus PSP (threshold FDR < 5% and |log2FC| > 0.584; Figure 3A–C; Table S5–S8). This evidence concerns the gene MTA2 and pelvic inflammatory disease.