X:MAP displaying the 5' end of ESR1. The web interface can be searched by gene symbol, Ensembl ID, location or probeset ID. The central portion of the viewer is interactive and can be scrolled in real time by dragging with the mouse. Orange filled bars represent exons. UTRs are indicated by the white-filled portions of the exons. The tree in the bottom left panel displays, for the gene of interest, a hierarchy showing the relationship between genes, transcripts, exons, probesets, probes and their genome hit. Specificity of the probe-genome match is also displayed. The bottom right panel is context sensitive and is used to present detailed information for the selected item in the tree. These include hyperlinks to external annotation resources.