TY - RPRT TI - In vitro SUMO-1 modification requires two enzymatic steps, E1 and E2. AU - T Okuma AU - R Honda AU - G Ichikawa AU - N Tsumagari AU - H Yasuda PY - 1999 DO - 10.1006/bbrc.1998.9995 UR - https://pubmed.ncbi.nlm.nih.gov/9920803/ ID - 9920803 ER -