Fig 5.

Field-effect detection within a complex sample. Absolute surface potential (a) and differential surface potential (b) for the hybridization of 20 nM oligonucleotides cA to A and cB to B within a 10-times-higher concentration of unrelated oligonucleotides. All injections were made at a constant 200 nM concentration. Arrows indicate injections of 200 nM C, then 20 nM cA + 180 nM C, and then 20 nM cB + 20 nM cA + 160 nM C.