This visualization summarizes gene expression data from a CSV file by computing the average expression levels of Gene X and Gene Y across all patients and displaying them as a two-bar bar chart. The chart renders in SVG, with axes and bars created using D3.js v7 methods such as `d3.scaleBand`, `d3.scaleLinear`, and `d3.axisBottom`. A summary line above the chart reports patient count and average values, and the SVG includes a decorative DNA helix illustration.