This bar chart displays protein localization data, comparing average expression values across subcellular locations for ovarian tumor samples. The visualization uses a vertical bar layout with the location categories on the y-axis and expression values on the x-axis. Built with D3 v7, the code employs `d3.csv` for tabular data loading, `scaleLinear` and `scaleBand` for axes, and standard margin conventions with `axisLeft` and `axisBottom` to render the SVG chart, styling bars in steel blue.