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Table 3 The most frequent single-word, two-word and three-word descriptors, along with their total frequency in the corpus

From: Mining semantic networks of bioinformatics e-resources from the literature

Single word descriptors Two-word descriptors Three-word descriptors
gene: 13,585 gene expression: 1,147 protein-protein interaction: 308
method: 8,203 secondary structure: 887 multiple sequence alignment: 295
protein: 6,417 protein sequence: 780 gene expression data: 262
sequence: 5,991 protein structure: 574 amino acid sequence: 257
analysis: 4,287 microarray experiment: 488 Smith-Waterman algorithm: 48