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Histological features of the serous and mixed glands within the lamina propria of the respiratory mucosa. (a) Crossmon’s trichrome. Bar=50 µm. Mixed glands (b, d, e). Serous glands (c, f, g). PAS (b, c). Alcian blue (pH 2.5) (d, f). Alcian blue (pH 1.0) (e, g). M, mixed gland; S, serous gland. Bars=20 µm in (b)–(g).
