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Resistance increases linearly with crystal length, consistent with a hopping mechanism. (A) Four-probe resistance vs. length measurements of X1. P values: *P < 0.05; **P < 0.01. (B) Electron flux (J) vs. number of carriers calculated from A. Values represent mean ± SEM (n = 3). (Inset) Schematic of hole hopping through tyrosines with their edge-to-edge distance labeled.
