petunia plants obtained by pollination with pollen pretreated with phage transducing the e. coli gene for hexose-1-phosphate uridyltransferase ( e.c . 2.7.7.12 ) , showed , over all the six generations so far tested , a significant better growth and development on galactose media than controls .
C0019494
hexose
C0016945
galactose