Eukaryotic gene regulation: cytoplasm.
- mRNA degradation: degradation
of an mRNA in the cytoplasm limits its lifespan.
Review 1: 
- Protein processing:
many proteins are activated by signal molecules in transduction
pathways.
- Protein degradation:
proteasomes
degrade proteins
at the end of their useful lifespan.
Review 2:
Summary exercise: 
