Answer: 200 types
Notes: Scientists estimate that the human body contains around 37 trillion cells and 200 different cell types. This includes 50 billion fat cells and 2 billion heart muscle cells. The number of bacterial cells inside a human body is around 38 trillion. This is much closer to the estimated 30 trillion human cells in the body. Scientists used data reported by others about individual organs and some mathematical modeling to obtain their results.
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