The brain protein contains a unique combination of domains, small functional chunks of proteinsequence that may be common to other proteins as well.
脑蛋白包含一个独一无二的结合区域，微小的蛋白质序列功能块也可能与其他的蛋白质一样。
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Then along came RNA editing, in which guide RNAs or enzyme action modify some messenger RNAs such that the final proteinsequence cannot be deduced from the gene sequence alone.
"I asked, What's the probability that I would see a human DNA polymerase [protein] sequence and another protein with an E. coli DNA polymerase sequence?" he explained.