Inferred yeast module network. All the regulations identified in yeast module network are positive. Considering such characteristics of the modules and directions of the arcs between modules, the obtained network is believed to code a partially consistent regulatory relationship between modules recalled from the time sequence of the phase in cell cycle. All the relationships among modules indicate that each module has some regulatory impact on its follow-up modules, according to the peaks each module stands for. There is one exception: Module 5 has an up-regulation on Module 4, which shows that some feedback may exist in yeast cycle process.