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Table 2 The STRING analysis of the AD specific protein network where corrected difference in observation frequency and the Chi Square value were both greater than 15 that showed: nodes, 1248; number of edges, 5604; average node degree, 8.98; avg. local clustering coefficient, 0.321; expected number of edges, 5362; PPI enrichment p-value, 0.000516

From: The plasma peptides of Alzheimer’s disease

Term ID

Term description

Observed gene count

Background gene count

False discovery rate

KW-0025

Alternative splicing

821

10223

1.98E-18

KW-0963

Cytoplasm

379

4972

0.0178

GO:0005829

cytosol

405

4958

0.0000291

GO:0044444

cytoplasmic part

695

9377

0.0000291

GO:0005737

Cytoplasm

809

11238

0.0000436

GO:0005622

Intracellular

983

14286

0.0007

GO:0044424

Intracellular part

966

13996

0.0007

GO:0043226

Organelle

866

12432

0.0022

GO:0005623

Cell

1092

16271

0.0029

GO:0044464

Cell part

1090

16244

0.003

GO:0043229

Intracellular organelle

848

12193

0.0034

GO:0043231

Intracellular membrane-bounded organelle

729

10365

0.0096

GO:0044422

Organelle part

649

9111

0.0096

GO:0005768

Endosome

85

876

0.0158

GO:0043227

Membrane-bounded organelle

781

11244

0.0158

GO:0098576

Lumenal side of membrane

9

29

0.0219

GO:0055037

Recycling endosome

24

164

0.024

GO:0044446

Intracellular organelle part

627

8882

0.0287

GO:0071556

Integral component of lumenal side of endoplasmic reticulum

8

26

0.0404

GO:0003824

Catalytic activity

435

5592

0.0028

GO:0005488

Binding

830

11878

0.0174

GO:0008152

Metabolic process

696

9569

0.0108

GO:0051726

Regulation of cell cycle

115

1129

0.0108

GO:0010564

Regulation of cell cycle process

76

684

0.0175

GO:1901990

Regulation of mitotic cell cycle phase transition

47

351

0.0175

GO:0045786

Negative regulation of cell cycle

61

517

0.0186

GO:0010821

Regulation of mitochondrion organization

26

148

0.0187

GO:0044237

Cellular metabolic process

637

8797

0.0187

GO:0044238

Primary metabolic process

638

8808

0.0187

GO:0071704

Organic substance metabolic process

657

9135

0.0187

GO:1901987

Regulation of cell cycle phase transition

49

385

0.0187

GO:0008104

Protein localization

172

1966

0.0208

GO:0007346

Regulation of mitotic cell cycle

67

608

0.0212

GO:0006807

Nitrogen compound metabolic process

603

8349

0.0286

GO:0009056

Catabolic process

162

1859

0.0286

GO:0009987

Cellular process

994

14652

0.0286

GO:0010823

Negative regulation of mitochondrion organization

13

50

0.0286

GO:0044248

Cellular catabolic process

147

1646

0.0286

GO:0048583

Regulation of response to stimulus

306

3882

0.0286

GO:0051641

Cellular localization

186

2180

0.0286

GO:0080134

Regulation of response to stress

120

1299

0.0286

GO:0097190

Apoptotic signaling pathway

39

295

0.0286

GO:1901564

Organonitrogen compound metabolic process

401

5281

0.0286

GO:0032270

Positive regulation of cellular protein metabolic process

134

1496

0.0315

GO:0019538

Protein metabolic process

324

4194

0.0389

GO:0044403

Symbiont process

68

650

0.0389

GO:0007093

Mitotic cell cycle checkpoint

24

153

0.0434

GO:0044260

Cellular macromolecule metabolic process

472

6413

0.0434

GO:0016032

Viral process

61

571

0.0439

GO:0016197

Endosomal transport

27

185

0.0452

GO:0051128

Regulation of cellular component organization

191

2306

0.0452

GO:0051247

Positive regulation of protein metabolic process

139

1587

0.0452

GO:0043170

Macromolecule metabolic process

539

7453

0.0463

  1. Keywords, GO components, processes and functions from STRING analysis of gene symbols with a χ2 ≥ 25 for AD versus AD control
  2. The supporting information from the STRING analysis may be found in Additional files 2, 3, 4: Table S2–S4