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Surfactant protein D (SP-D) is synthesized and secreted by lung epithelial cells. It belongs to group III of the family of C-type lectins and members of this group has overall structure consisting of multiple globular 'head' regions linked by triple-helical, collagen-like, strands. This group also includes SP-A and the serum proteins mannan-binding protein, conglutinin and collectin-43, all of which have been shown to bind to the C1q receptor found on a wide variety of cells. Both SP-D and SP-A have been shown to enhance oxygen radical production by alveolar macrophages.
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Protein Aliases: Collectin-7; Collectin7; Lung surfactant protein D; PSP-D; PSP-D Surfactant protein D; pulmonary surfactant apoprotein; Pulmonary surfactant associated protein PSP-D; Pulmonary surfactant-associated protein D; SFTP 4; Surfactant associated protein pulmonary 4; surfactant-associated protein, pulmonary 4
Gene Aliases: AI573415; COLEC7; PSP-D; PSPD; SFTP4; SFTPD; SP-D
UniProt ID: (Human) P35247, (Mouse) P50404
Entrez Gene ID: (Human) 6441, (Mouse) 20390
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