passages.id: split_1_test_1426_passage
passages.type: progene_text
passages.text: The cDNA of CL-43 was cloned and the open reading frame was found to encode a protein of 301 amino - acid residues , including an N - terminal region of 28 residues , a collagen region of 114 residues and a neck - CRD region of 159 residues .