There were long stretches of DNA in between genes that didn't seem to be doing very much; some even referred to these as "junk DNA," though a certain amount of hubris was required for anyone to call any part of the genome "junk," given our level of ignorance.
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About Francis S. Collins, The Language of God: A Scientist Presents Evidence for Belief
Francis S. Collins, The Language of God: A Scientist Presents Evidence for Belief.