Before revision:  Additionally, we define model variants that allow to study the age dependency of interactions under different prescriptions of duplication-divergence growth. Comparing with empirical data , we show that the model reproduces the observed universal behavior allowing a variant-independent fit of parameters.
After revision:  We then employ this unified framework to address the specific issue of the age dependence of protein interactions, through the definition of three different node wiring/divergence schemes. Comparison with empirical data , we show that the model reproduces the observed universal behavior allowing a variant-independent fit of parameters.