I think I've said that here before, but couldn't support it at the time. I just happened to come across an explicit statement of this last night.
Quote:
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"In fact, the number of bacteria that normally inhabit the human body (about 700 trillion cells) exceeds the number of its own human cells (about 70 trillion)." (Biology: Fifth Edition, Solomon, Berg, & Martin, Harcourt College Publishing, 1999, p497)
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