Expression of Naja naja sputatrix cardiotoxin in Escherichia coli: M. S. L. Yeo,1L. Earnest,1K. Jeyaseelan,1P. Gopalakrishnakone,2C. H. Tan1 and A. Ménez3 (Departments of 2Anatomy, and 1Biochemistry, National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511; and 3Départment d'Ingénierie et d'Etudes des Protéines, Commissariat A L'Energie Atomique, Centre D'Etudes De Saclay, F-91191, Gif-sur-Yvette, Cedex, France)