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On the question of miso soup: is it GF?

As I investigate every credible source I am learning that it depends
entirely on the maker of the miso. That is to say that miso should be
made only from soy, however, some makers use gliadin or wheat/rye/barley
gluten containing products. -Randy in San Francisco, California (first
posting, diagnosed June 12, 2001 at U.C.S.F.)