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The transplantable argyrophilic gastric carcinoids producing histamine found in Praomys (Mastomys) natalensis contained no significant amount of vitamin B12-binding proteins. It was also demonstrated that the concentration of vitamin B12-binding proteins in glandular stomach of mastomys was much lower than those in the same tissues of the rat or mouse.pmid:1001869 fatcat:gcifmhquhvam7a7ttjzfeithxq