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||The intestinal habitat contains some 400 to 500 different bacterial species (primary sources), but relatively little is known about which substrates support their growth in the intestine, which metabolic pathways are important, and which genes are required (Sweeney et al. 1996, PMID 8751890). See BNID 102387, 105707. See Suau et al., 1999 PMID 10543789 p.4805 left column 2nd paragraph:"It has been documented (PMID 4598229) that 400 to 500 species inhabit
the human intestinal tract, but this value originated from statistical
analyses: only 113 species were isolated (PMID 4598229) from 20