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Table 1 Ambiguity and variability in a dictionary.

From: Normalizing biomedical terms by minimizing ambiguity and variability

Concept ID

Term

1

IL2

1

IL-2

1

Interleukin

2

IL3

2

IL-3

2

Interleukin

3

ZFP580

3

ZFP581

3

Zinc finger protein

This is an imaginary dictionary consisting of three concept IDs. All terms belonging to the same concept ID are assumed to be synonymous (conveying the same meaning).