TY - RPRT TI - Directed evolution towards protease-resistant hirudin variants. AU - Frank Wirsching AU - Martina Keller AU - Christian Hildmann AU - Daniel Riester AU - Andreas Schwienhorst PY - 2003 DO - 10.1016/j.ymgme.2003.09.007 UR - https://pubmed.ncbi.nlm.nih.gov/14654359/ ID - 14654359 ER -