Zein is a protein in corn ("maize" outside the U.S.) that, if held side-by-side against the gliadin protein of wheat, rye, or barley, overlaps substantially in structure (i.e., amino acid sequence). In other words, the zein protein of corn resembles the gliadin protein of other grains—not identical but with overlapping similarities in structure. This should come as no surprise, as corn and other grains share evolutionary history as grasses, not to mention ongoing exchange of genetic material over eons, given the impressive promiscuity of grasses and their ability to share and combine genetic material. (Recall how 14-chromosome ancient einkorn wheat mated with various wild grasses over the last several thousand years to yield modern 42-chromosome Triticum aestivum wheat....
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