In the top selection box, the virus and the receptor gene are co-selected, i.e. when a virus is selected, the "Receptor" field will turn to the correspondent ones, vice verse. As for the "Expression Value" field, user can choose according to their own needs.

The boxplot display the expression level across 33 TCGA project. Orange box represent cancer tissue and the green one represent normal tissue. The meaning of Y-axis changes depending on user's choice.