Protein Interaction Network Robustness — 2D Percolation View

Protein-protein interaction networks inside a cell are scale-free: a handful of hub proteins carry a disproportionate share of all interactions, while most proteins connect to only one or two partners. This 2D companion grows the same real Barabási–Albert scale-free network, lays it out with an independent 2D force-directed physics engine, and adds a live percolation chart that tracks the giant connected component's size against the analytic Molloy–Reed collapse threshold as you knock proteins out — either uniformly at random or by targeting the current highest-degree hub. The result quantifies, rather than just illustrates, the landmark network-biology finding that these networks tolerate random protein loss far better than they tolerate targeted hub removal.