Explanation of NREL/TP-510-426181 laboratory analytical procedure. 1A. Sluiter, B. Hames, R.O. Ruiz, C. Scarlata, J. Sluiter, D. Templeton, D. Croker, Determination of Structural Carbohydrates and Lignin in Biomass, Biomass Analysis Technology Team Laboratory Analytical Procedure, National Renewable Energy Laboratory Golden, CO, 2010 NREL/TP-510-42618.