Plate XV 



No. 26 Effect of 7 millimolar adenine on a chick osteoblast in mitosis. X 2000 

 (reduction 8/10). (0) Cell in metaphase. One minute after addition of adenine. 

 (b) Cell in anaphase. 10 minutes later than (0). (c) Anaphase movement has 

 ceased and cell has not divided. Nuclear reconstruction in progress. 18 minutes 



{Continued on opposite page.) 



