text: Galactolysis refers to the catabolism of galactose.
  In the liver, galactose is converted through the Leloir pathway to glucose 6-phosphate in the following reactions:
          galacto-                uridyl                phosphogluco-
           kinase               transferase                mutase
      gal --------> gal 1 P ------------------> glc 1 P -----------> glc 6 P
                              /             v
                           UDP-glc       UDP-gal
                                 epimerase