Cell Cycle Ontology

"CCO basically contains genes, proteins, interactions (comprising genes or proteins that participate in them), processes from the cell cycle subtree of GO, molecular functions (GO), taxa, and ontological constructs (like an upper level ontology and relationships) to stick everything together. The knowledge represented in the system is expected to grow in quantity (integrating more data and different resources) and quality (organizing everything with Ontology Design Patterns and new relationships)."