D.  Chand, Varshney, N. K., Ramasamy, S., Panigrahi, P., Brannigan, J. A., Wilkinson, A. J., and Suresh, C. G., ?Structure mediation in substrate binding and post-translational processing of penicillin acylases: Information from mutant structures of Kluyvera citrophila penicillin G acylase?, Protein Science, vol. 24, no. 10, pp. 1660-1670, 2015.