What are chitobiases or chitobiohydrolases?

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Enzymes hydrolyzing N,N'-diacetylchitobiose into the substituent two GlcNAc residues were earlier also named chitobiases. Another name, chitobiohydrolase, was used sometimes for these enzymes, as well as for exo-chitinases cleaving N,N'-diacetylchitobiose off the non-reducing end of chitin. Both names are misleading and were abandoned by the Commission on Enzyme Nomenclature.