And although each cell has roughly 2,000 genes -- that's one tenth the size of the human genome -- as you sequence more and more, you find that they only have a thousand of those in common and the other thousand for each individual strain is drawn from an enormous gene pool, and it reflects the particular environment that the cell might have thrived in, not just high or low light or high or low temperature, but whether there are nutrients that limit them like nitrogen, phosphorus or iron.
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