In 2003, Shiwei Shun, Lunjiang Ling, Nan Zhang, Guojie Li, and Runsheng Chen published a paper titled Topological structure analysis of the protein-protein interaction network in budding yeast in Nucleic Acids Research. As the title of the paper very well conveys, the study involved an analysis of the different interactions between various proteins that are present in yeast. In this recipe, we will consider this protein-protein interaction network of yeast and study its properties. So, let's dive in.