these facts , together with information gathered from an examination of the distribution of beta-galactosidase phenotypes among over 100 inbred strains ( breen , lusis and paigen 1977 ) , have led us to conclude that the postnatal developmental pattern for liver beta-galactosidase is determined by a set of interacting temporal genes .
C0016955
galactosidase
C0005220
beta-galactosidase