activity of pnp-beta-galactosidase in normal brain tissue , like that of cerebroside beta-galactosidase from the same source , was considerably more heat-stable than the activity of either 4-mu-beta-galactosidase or the predominant gm1 beta-d-galactosidase ( ec 3.2.1.23 ) .
C0005220
beta-galactosidase
C0016955
galactosidase