INTER- AND INTRADIGM-MODULARITY. “Patil et al., concluded that transient hubs are more likely to interact intermodularly, allowing communication between different modules (a module simply being a highly interconnected process, like the transcription initiation machinery), whereas the stable hubs are more likely to interact intramodularly, allowing for the formation of the modules.”
http://www.biochemj.org/content/454/3/361?sa=X&ved=0CDkQ9QEwEWoVChMIzdjAo5n2xgIVovRyCh0HSAum