Field, R 2019, ' Structural and functional analysis of glycoside hydrolase 138 enzymes targeting chain A galacturonic acid in the complex pectin rhamnogalacturonan II ', Journal of Biological Chemistry, vol. 294, no. 19, 294, pp. 7711–7721 . https://doi.org/10.1074/jbc.ra118.006626 JOURNAL OF BIOLOGICAL CHEMISTRY J Biol Chem