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A 44-year-old man comes to the physician because of a 6-month history of persistent cough with yellow mucus and worsening shortness of breath. One year ago, he had similar symptoms that lasted 4 months. He has smoked two packs of cigarettes daily for the past 20 years. Goblet cells and glands typical for the respiratory tract are involved in the production of mucus. What type of glands do we find here? (See figure)