(A, E, I) The current trace without the presence of peptide. (B, F, J) The current trace of the peptide in conductance buffer. (C,G, K) The current blockage resulted from the addition of K10, or K14, or K6/10/14 mixture. (D,H, L) The scatter plot resulted from the addition of K10, or K14, or K6/10/14 mixture to the C-Δ25 GP10 connector.