passages.id: split_1_test_1752_passage
passages.type: progene_text
passages.text: Using mRNA from oxysterol - treated human THP-1 cells together with 5'-rapid amplification of cDNA ends and polymerase chain reaction , we identified a novel ABCG1 transcript that encodes a putative protein of 786 residues containing a new amino terminus of 203 amino acids .