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Collectins are constructed of four domains: an N-terminal cysteine-rich segment, a collagen-like region, a neck region and a C terminal carbohydrate recognition domain (CRD). MBL usually forms trimers to hexamers. CL-K1 forms dimers and trimers of trimeric subunits. SP-A and SP-D are mainly hexamers and cruciform tetramers. The subunit of CL-LK are formed by two CL-K1 and one CL-L1 approximately.
