848 



PERIODIC FUNCTIONS IN MAMMALS 



DNA 



— LIVER- 



MR NA 



08:00 



24.00 



08:00 



Fig. 23. Shift in phase of rhythms in nucleic acid specific activities in 

 mouse liver after inversion of lighting regimen. 



D8 9~'5 months of age 



160 



60 



08:oo 12:00 i6:oo 20:00 00:00 04:00 



Time of Day 



Fig. 24. Shift in phase of serum corticosterone rhythm after inversion 

 of lighting regimen in mouse. 



