The role of residues R97 and Y331 in modulating the pH optimum of an insect 'beta'-glycosidase of family 1 - Marana, Sandro Roberto; Mendonça, Lúcio Mário Ferreira de; Andrade, Eduardo Henrique Pereira; Terra, Walter Ribeiro; Ferreira, Clélia (European Journal of Biochemistry, 2003)