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  • frequencies
  • The long region of haplotype conservation reflects a recent origin, and this, together with high frequencies, is evidence of positive selection, but also means that −13910*T might be an associated marker, rather than being causal of lactase persistence itself. (blogspot.com)
  • In a new study, Uppsala University researchers together with South African researchers show that lactase persistence variants were at medium frequencies in the Khoe people, but at very low frequencies or absent among San hunter-gatherers. (eurekalert.org)
  • Lactase persistence-frequencies are highly variable. (wikipedia.org)
  • In Europe, the distribution of the lactase persistence phenotype is clinal, with frequencies ranging from 15-54% in the south-east to 89-96% in the north-west. (wikipedia.org)
  • High frequencies of lactase persistence are also found in some places in Sub-Saharan Africa and in the Middle East. (wikipedia.org)
  • hydrolysis
  • Studies of E. coli lactase have proposed that hydrolysis is initiated when a glutamate nucleophile on the enzyme attacks from the axial side of the galactosyl carbon in the β-glycosidic bond. (wikipedia.org)
  • produce
  • There are a number reasons that people don't have the ability to produce lactase (a discussion too extensive for this column). (drgourmet.com)