- Human 3'-phosphoadenosine 5'-phosphosulfate synthetase 1 (PAPSS1) and PAPSS2: gene cloning, characterization and chromosomal localization. Xu, Z.H., Otterness, D.M., Freimuth, R.R., Carlini, E.J., Wood, T.C., Mitchell, S., Moon, E., Kim, U.J., Xu, J.P., Siciliano, M.J., Weinshilboum, R.M. Biochem. Biophys. Res. Commun. (2000)