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 over different tissue/organ and age. We divide younger and older group by 60 years old. The meaning of Y-axis changes depending on user's choice.