P. M.  Chandra, Brannigan, J. A., Prabhune, A., Pundle, A., Turkenburg, J. P., Dodson, G. G., and Suresh, C. G., ?Cloning, preparation and preliminary crystallographic studies of penicillin V acylase autoproteolytic processing mutants?, Acta Crystallographica Section F-Structural Biology and Crystallization Communications, vol. 61, no. Part 1, pp. 124-127, 2005.