Hydrolysis of a bond between two residues of a biopolymer in which the residues are not located at either end of the polymer (see, for example, the catalyzing action of endopeptidase).
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The enzyme made by 229 aminoacid residue (Table 2) and it functioned as Endohydrolysis of (1 [right arrow] 4)-[beta]-D-xylosidic linkages in xylans (Torronen et al.