TY - RPRT TI - A collaborative study to establish a U.S. reference for tissue plasminogen activator (t-PA). AU - D P Beebe AU - L L Wood PY - 1991 DO - 10.1016/1045-1056(91)90040-q UR - https://pubmed.ncbi.nlm.nih.gov/1954004/ ID - 1954004 ER -