Figure 7-4. Illumination apparatus for the inactivation of cells 

 with BrdU-containing DNA. 



Note: Plastic culture dishes containing 2 

 white fluorescent light for 60 minutes. 



X 10 cells each are subjected to 



Figure 7-5. Macroscopic colonies in four randomly selected dishes 

 approximately seven days after illumination with white light. 



Note: These clones, originating from cells surviving selection, are tested to 

 determine if any are auxotrophic mutants. 



85 



