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Schematic presentation of novel matriptase AS transcripts. Four LDL receptor class A domains are found in matriptase (LDLRA1: residues 452–486, LDLRA2: residues 487–523, LDLRA3: residues 524–561, and LDLRA4: residues 566–604). A1 and A3 are produced by skipping exon 12 (encoding LDLRA1) and exon 14 (encoding LDLRA3), resulting in in-frame deletion of 105 and 114 bp, respectively. CAT: serine protease catalytic domain.
