The protein-protein interaction (PPI) network was constructed by STRING (https://string-db.org/) [51] using the multiple proteins process and choosing the “Homo sapiens” as background. To improve accuracy and intuitiveness, we set the minimum interaction score as 0.4, the number of k-means clusters as 8, and hid disconnected nodes. In addition, the core genes were evaluated by the degree of connectivity, and a sub-core network was built with the same condition.
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