Discussion
A famous book titled '10% Human' argues that human cells are just 10% of body. The rest 90% cells are now considered key to our health. These 90% cells are mainly :
Answer: B
The cells are mainly cells of gut microbes.
Alanna Collen's 10% Human (2015) is about the human microbiota, the bacteria and other microbes living on and in the body, most of them in the gut. Its title comes from the long-quoted estimate that microbial cells outnumber human cells by about nine to one, and its argument is that these microbes are central to digestion, immunity and even mood.
Later studies have revised the ratio closer to one to one, but the book's subject is unchanged. Junk DNA is non-coding DNA inside our own cells, stem cells are human cells, and CRISPR-modified cells are an engineering product, not a natural majority of the body.
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