2X2Y:
reference: Rational engineering of mannosyl binding in the distal glycone subsites of Cellulomonas fimi endo-beta-1,4-mannanase: mannosyl binding promoted at subsite -2 and demoted at subsite -3 ., Hekmat O, Lo Leggio L, Rosengren A, Kamarauskaite J, Kolenova K, Stalbrand H, Biochemistry. 2010 Jun 15;49(23):4884-96. PMID: 20426480

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