1. Introduction
2. Observations and Analysis
2.1 Data
2.2 Modeling
3. Results
4. Discussion
4.1 Mass concentration parameter as a function of evolutionary state
4.2 Turbulent and clumpy disks
4.3 Secular evolution is efficient at high redshift
4.4 Large turbulent velocities driven by cold flows
4.5 Comparison to simulations
4.6 Comments on asymmetries
4.7 Consequences for galaxy evolution
5. Conclusions