Table 3.

The associations between entities of PREGO after co-occurrence analysis: The supported entity types of associations are Environments—Biological Processes, Environments—Molecular Functions, Taxa—Environments, Taxa—Biological Processes, Taxa—Molecular Functions.

Channel	Source	Environments—Processes	Environments—Functions	Taxonomy	Taxa—Environments	Taxa—Processes	Taxa—Function
Literature	MEDLINE PubMed—PMC OA	883,997	422,579	Strains	69,968	590,630	384,079
				Species	778,877	3,501,635	1,961,920
				Total	1,669,608	7,969,310	4,613,827
Environmental samples	MG-RAST amplicon	-	-	Strains	13,645	-	-
				Species	39,007
				Total	53,439
	MG-RAST metagenome	-	620,846	Strains	262,106	-	8,626,328
				Species	103,913		10,715,548
				Total	372,301		19,950,096
	MGnify amplicon	-	-	Strains	18	-
				Species	30,122	351	-
				Total	111,976	2097
Annotated Genomes and Isolates	JGI IMGisolates	-	-	Strains	8229	-	3,461,693
				Species	42,141		13,216,559
				Total	50,888		16,821,850
	STRUO	-	-	Strains	-	-	1803
				Species			4,070,195
				Total			4,079,312
	BioProject	-	-	Strains	3263	7473
				Species	4187	4294
				Total	7641	12,169
Total	All	883,997	1,043,425	Strains	357,229	598,103	12,473,903
				Species	998,247	3,506,280	29,964,222
				Total	2,265,853	7,983,576	45,465,085