{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,6]],"date-time":"2025-10-06T05:10:58Z","timestamp":1759727458122,"version":"build-2065373602"},"reference-count":19,"publisher":"BMJ","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Med Genet"],"published-print":{"date-parts":[[1979,12]]},"abstract":"<jats:p>Pepsin 1, the ulcer-associated pepsin, occurred significantly more frequently in the gastric juice of those patients with duodenal ulcer who did not secrete A, B, or H antigens into gastric juice than in those secreting these antigens. This observation may explain the increased proportion of such non-secretors among patients with duodenal ulceration. In patients with gastric ulcer and non-ulcer dyspepsia, and in a miscellaneous group of patients, there was no association of pepsin 1 secretion with secretor status, suggesting that the association noted in duodenal ulceration is an indirect rather than a direct one. No increase of pepsin 1 occurred in group O patients with peptic ulcer, so that the increased proportion of such patients in peptic ulcer does not arise from differences in pepsin 1 secretion.<\/jats:p>","DOI":"10.1136\/jmg.16.6.423","type":"journal-article","created":{"date-parts":[[2008,11,10]],"date-time":"2008-11-10T14:50:51Z","timestamp":1226328651000},"page":"423-427","source":"Crossref","is-referenced-by-count":6,"title":["Hereditary aspects of duodenal ulceration: pepsin 1 secretion in relation to ABO blood groups and ABH secretor status."],"prefix":"10.1136","volume":"16","author":[{"given":"L","family":"Waft","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"N B","family":"Roberts","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W H","family":"Taylor","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[1979,12,1]]},"reference":[{"key":"ref_1","first-page":"1046","article-title":"The insulin test in the unoperated subject","volume":"10","author":"Baron, J.H.; Gutierrez, L.V.; Spencer, J.; Tinker, J.; Welbourn, R.B.","year":"1969","unstructured":"Baron, J. 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