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Criteria used when counting fibrocytes in bronchial biopsies. Sections from patients and controls were based on an intact basement membrane together with intact tissue of at least 70 μm in every section. Area A starts were the basement membrane ends. A = 0–70 μm in the section. B = 71–140 μm in the section and C = 141–210 μm in the tissue. Definition of abbreviations: BM = Basement membrane, E = epithelium, MF = Muscle fibers.
