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Table 9 The ten most frequent types of semantic relations extracted from the whole MEDLINE

From: Wide-coverage relation extraction from MEDLINE using deep syntax

Rank Semantic relation type #Relation #Unique
  Entity 1 Entity 2   
1 Amino acid, Peptide or protein Amino acid, Peptide or protein 3,424,145 1,057,771
2 Cell Amino acid, Peptide or protein 3,140,492 711,603
3 Gene or genome Amino acid, Peptide or protein 1,821,923 766,084
4 Disease or syndrome Disease or syndrome 1,780,634 599,355
5 Body part, Organ, or Organ component Amino acid, Peptide or protein 1,720,271 561,839
6 Amino acid, Peptide or protein Disease or syndrome 1,621,104 631,343
7 Gene or genome Cell 1,142,425 315,794
8 Organic chemical Organic chemical 1,122,133 365,631
9 Body part, Organ, or Organ component Body part, Organ, or Organ component 1,119,095 270,886
10 Laboratory procedure Amino acid, Peptide or protein 1,109,260 453,359