Endogenous Pacemakers and Exogenous Zeitgebers 3

- These are influenced by SCN, but can act independently

- Damiola

- Changing feeding patterns in mice could change circadian rhythms in liver cells 

- Up to 12 hours

- But SCN is unaffected

- Therefore there may be other influences on sleep/wake cycle aside from the SCN

Ethics in animal studies

- Animals exposed to harm and risk when returned…