This interactive visualization presents a hierarchical tree of medical data sourced from a GitHub repository. The visualization shows a tree structure where nodes represent medical concepts, and users can click on nodes to expand or collapse their children and view detailed information. The tree is rendered using the D3.js library’s hierarchical layout algorithm, with SVG for rendering and CSS transitions for smooth animations. The code also includes a categorization function that uses regular expressions to classify nodes into medical categories like diseases, treatments, and biological processes.