PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 1396715-7 1992 With respect to the galactose moiety, it is shown here that HO-3" and HO-2" are necessary for hydrolysis of the substrates by lactase. Galactose 20-29 lactase Homo sapiens 126-133 1396715-8 1992 Using these chemically modified substrates, it has been confirmed that lactase does not behave as a typical beta-galactosidase, since it does not show an absolute selectivity with respect to substitution and stereochemistry at C4" in the galactose moiety of the substrate. Galactose 238-247 lactase Homo sapiens 71-78