In the Schematic Graphs Below, the Red Color Indicates High

Short Answer

In the schematic graphs below, the red color indicates high gene expression and blue color indicates low gene expression. The expression level is plotted as a function of the concentrations of two transcription regulatory proteins, A1 and A2. Which graph (1 or 2) do you think corresponds to an "AND NOT" combinatorial logic? Write down 1 or 2 as your answer.