> Originally it was thought our cells were outnumbered 10 to one. > > "That's been refined much closer to one-to-one, so the current estimate is you're about 43% human if you're counting up all the cells," he says. > > But genetically we're even more outgunned. > > The human genome - the full set of genetic instructions for a human being - is made up of 20,000 instructions called genes. > > But add all the genes in our microbiome together and the figure comes out between two and 20 million microbial genes. Source: https://www.bbc.com/news/health-43674270