Parallel determinations were made, of 10 individual serum proteins and of proteins in the bronchial secretion obtained by aspiration from 8 subjects that did not show manifest bronchopulmonary disease. By application of the formula suggested by Deuschl and Johansson it was found that 37 percent of IgG, 84,5 percent of IgA, 48,9 percent of transferrins, 15,2 percent of alpha-1-anti-trypsin and 11,3 percent of ceruloplasmin present in the bronchial secretion are synthetised in the bronchial mucosa itself, while the rest occur as a result of diffusion from the blood. Acid alpha-1-glycoprotein and haptoglobin from the bronchial secretion originate in the blood. IgM was evidenced in the bronchial aspirate in only 3 subjects, and alpha-2 macroglobulin was not found in any of the subjects.
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