Degree of overlap among gene-PMID pairs in different pairwise combinations of data sources in the pubmed2ensembl database.

Numbers reflect the percentage of overlapping gene-PMID pairs for a column-row combination, relative to the total number of gene-PMID pairs from the data source on the left-most column. For example, gene-PMID pairs found in both Entrez Gene and MEDLINE comprise 22.2% of the total number of pairs from the Entrez source but only 10.6% of the total number of pairs from the MEDLINE source.