First, systems biology is an inter-disciplinary approach, requiring the combined talents of biologists, mathematicians, and computer scientists. Second, systems biology is holistic, with the goal of obtaining a comprehensive understanding of the workings of biological systems. This is achieved through the acquisition of massive amounts of data by high-throughput technologies-oligonucleotide microarrays, mass spectrometry, and next-generation sequencing-and the analysis of this data through sophisticated mathematical algorithms.