Microbiome: Microbial Mystery
This NATURE OUTLOOK article describes how gut bacteria have an important but elusive role in the formation of colorectal cancer
Five years ago, four women and two men donated samples of their gut bacteria to science. Three women had healthy guts, but the other donors had colorectal cancer. Researchers implanted the human gut microorganisms into 'germ-free' mice, which were delivered by Caesarean section and reared in sterile cages, and so lacked gut microbes of their own.