A 45-year-old woman with a history of H. pylori infection (treated 2 years ago) presents with recurrent epigastric pain. Endoscopy shows an antral ulcer. A 38-year-old man with chronic aspirin use for secondary prevention of MI presents with acute epigastric pain. Endoscopy shows a duodenal ulcer. Which finding best distinguishes the location and pattern of these two ulcer types?

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