passages.id: split_4_test_2488_passage
passages.type: progene_text
passages.text: A 1.2 - kb cDNA fragment encoding a platelet 47 - kDa protein has been isolated from a human bone marrow cDNA library by using a degenerate oligonucleotide of the sequenced amino terminus of the purified platelet protein with a poly(dT)(12).(dG) by polymerase chain reaction .