This suggests that an increas-ing aptamer length increases the sensitivity of color transitions.In particular, the difference in length by 11 bases between 3 (65bases, non-hairpin) and 4 (54 bases, non-hairpin) resulted in a 7.2%CR difference. Contrastingly, 1 and 2 differ only by a length of 6 car-bons in the carbon linker from the 5base to the original PDA sidechain. This small change in the linker length has an insignificanteffect on color transitions (Fig. 1B)