passages.id: split_5_test_2875_passage
passages.type: progene_text
passages.text: Two previously unidentified ubiquitinated proteins with molecular masses of 10 and 17 kDa were found in 8 M urea - soluble extracts , obtained from Tris - buffer - insoluble materials , of acute myeloid leukemia OCI / AML 1a cells and the cells from the leukemia patients .