Substrate inhibition. (A): Substrate inhibition models of GOOX, GOOX-V and GOOX-VN; dashed lines indicate substrate inhibition curves fitted with eq. 1 (uncompetitive substrate inhibition model); solid lines indicate inhibition curves fitted with eq. 2 (a modified Hill equation ). (B): Inhibition of xylo-oligosaccharides (dashed lines) and cello-oligosaccharides (solid lines) on GOOX activity; curves fitted using eq. 2; X2 to X6 - xylobiose to xylohexaose, correspondingly and G2 to G6 - cellobiose to cellohexaose, correspondingly.