loning and expression of cDNA coding for the anticoagulant hirudin from the bloodsucking leech Hirudo medicinalis: - Harvey, R P; Degryse, E; Stefani, L; Schamber, F; Cazenave, J P; Courtney, M; Tolstoshev, P; Lecocq, J Lecocq (Proc Natl Acad Sci USA, 1986)