||p.6220 left column top paragraph: "The human gut is colonized by an abundant, active, and diverse microbiota. This microbiota has been studied extensively
using culture-based assays and, more recently, by a variety of molecular methods including fluorescent in situ hybridization, terminal restriction fragment length polymorphism, membrane assays, microarrays, and direct sequencing of 16S libraries (primary sources). These studies have shown that
there are 400 to 500 human intestinal microbial species, with 30 to 40 species accounting for 99% of the total population (refs 9, 23, 24, primary sources 15, 35 BNID 117017)."