when the growth rate of yeast cells is decreased ( for instance by transferring the cells from a rich medium to a poor one , or when the cells enter the stationary phase , or when growth is inhibited by cycloheximide , or when valine is removed from the medium supporting growth of a valine-requiring mutant , or when a thermosensitive mutant is shifted to the non-permissive temperature ) there is a decrease in the levels of the four aminoacyl-trna synthetases tested .
C0007595
growth
C0007634
cells