Table 2. Protein Categories of LC-TIMS-MS/MS-Identified Proteins and Affiliated Cellular Location-Based Gene Ontology Codes^a.

Category	Identification method
Extracellular Matrix	GO:0005581: Collagen Trimer
	GO:0005584: Collagen Type I Trimer
	GO:0005589: Collagen Type VI Trimer
	GO:0005604: Basement Membrane
	GO:0031012: Extracellular Matrix
	GO:0062023: Collagen-Containing Extracellular Matrix
Other Matrix	GO:0005178: Integrin Binding
	GO:0005912: Adherens junction
	GO:0015629: Actin Cytoskeleton
	GO:0030478: Actin Cap
	GO:0043296: Apical Junction Comple)
	GO:0071065: alpha9-beta 1 integrin-vascular cell adhesion molecule-1 complex
Immunoglobulins	Protein Group
Apolipoproteins Chylomicrons	Protein Group
	GO: 0042627: Chylomicron
Complement Proteins	Protein Group
Other Blood Microparticle	GO: 0072562: Blood Microparticle
Other Secreted Proteins	GO:0005615: Extracellular Space
	GO:0005576: Extracellular Region
	GO:0070062: Extracellular Exosome

^aProtein categories of LC-TIMS-MS/MS-identified proteins and corresponding cellular location-based Gene Ontology codes used to assign proteins to categories. Immunoglobulins, apolipoproteins, and complement proteins were assigned based on protein group.