ORFs in the Saccharomyces cerevisiae Metabolic Network Sorted Into Functional Categories According to the Munich Information Center for Protein Sequences (MIPS)
| Functional Category | No. of ORFs |
| Metabolism | 646 |
| Energy | 158 |
| Cell Growth, Cell Division and DNA Synthesis | 30 |
| Transcription | 2 |
| Protein Synthesis | 15 |
| Protein Destination | 43 |
| Transport Facilitation | 104 |
| Cellular and Transport Mechanism | 97 |
| Cellular Biogenesis | 23 |
| Cellular Communication/Signal Transduction | 10 |
| Cell Rescue, Defense, Cell Death and Ageing | 32 |
| Ionic Homeostasis | 42 |
| Cellular Organization | 434 |
| Classification not yet Clear-cut | 3 |
| Unclassified Proteins | 14 |