Harjes, S., Bayer, P., & Scheidig, A. J. (2005). The Crystal Structure of Human PAPS Synthetase 1 Reveals Asymmetry in Substrate Binding. Journal of Molecular Biology, 347(3): 1, pp. 623-635. Retrieved from http://dx.doi.org/10.1016/j.jmb.2005.01.005.