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A novel collagen IV chain, α4(IV), has recently been identified in basement membranes. We describe part of the primary structure of the human α4(IV) polypeptide for the first time, which has been determined by cloning and sequencing of cDNAs encoding 241 amino acid residues of the COL domain and 231 residues of the NC1 domain. We also characterized a genomic DNA fragment containing 4 exons coding...
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