Figure 4. Protein network of the identified proteins constructed with the PathwayStudio 5.0 software. Each node represents either a protein entity or a control mechanism of the interaction. The legend of the interaction network is summarized under the figure. Numbers show the identified proteins: alpha-1β-glycoprotein (A1BG), neurofilament (NF), vitamin D-binding protein (DBP), fibrinogen gamma chain (FGG), pigment epithelium-derived factor (PEDF), immunoglobulin heavy chain gamma 3 (IGHG3), apolipoprotein A-IV (ApoA-IV), haptoglobin (HP), apolipoprotein E (ApoE), transthyretin (TTR), and immunoglobulin kappa chain C region (IGKC). These proteins are related to some functional classes and small molecules. The relations of binding, expression, and direct regulation were obviously displayed among these proteins.