貝殼素（英語：conchiolin），又稱殼蛋白、殼基質，由軟體動物外套膜上皮層中的腺細胞分泌的角蛋白。少量的貝殼素與軟體動物腺細胞分泌的碳酸鈣等共同形成了貝殼結構。貝殼三層結構中的最外一層「殼皮層」（periostracum）便是由貝殼素構成[1]。
參考
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