Several logic gates and switches can be accessed from two different combinations of a single set of fluorophore, receptor and spacer components.
Callan, JF., de Silva, AP., & McClenaghan, ND. (2004). Switching between molecular switch types by module rearrangement: Ca2+-enabled, H+-driven `Off-On-Off', H+-driven YES and PASS 0 as well as H+, Ca2+-driven AND logic operations. Chemical Communications, 0(18), 2048-2049. https://doi.org/10.1039/b405909c