ducts secretory
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颌下腺属混合腺，以混合性腺泡为主，有少量浆液性腺泡和黏液性腺泡，有闰管、颗粒曲管和分泌管；
The submandibular gland, which is a mixed gland containing more mixed acinus than serous acinus and mucous acinus, contains intercalated duct, GCT, and secretory duct.
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鸡血藤的韧皮部里面有许多分泌管,排列成赤褐色的圆环状。内部含有鞣质、还原糖和树脂等有机物。
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