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Alcohol dehydrogenase (ADH) isoenzymes different from those of the liver were shown to be present in the human gastric mucosa. Two ADH activity bands present in the gastric mucosa of surgical specimens from all 7 black and 11 white Americans studied were absent in 14 and barely detectable in 3 of 21 Japanese subjects evaluated. Similar ethnic differences pertained to both genders and were independent of the gastric pathology. The mobility of these bands on starch gel electrophoresis corresponded to those recently reported and named mu-ADH or sigma-ADH. The absence of these bands was associated with a 70% decreased capacity to reduce m-nitrobenzaldehyde, a preferred substrate for sigma-ADH, suggesting that the bands missing from the Japanese stomachs comprise this isoenzyme.
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