Cloning and expression of a CDNA coding for the anticoagulant hirudin from the bloodsucking leech, Hirudo medicinalis - Harvey, RP; Degryse, E; Stefani, L; Schamber, R; Cazenave, JR; Courtney, M; Tolstoshev, P; Lecocq, JP (Proc Natl Acad Sci USA, 1986)