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Histograms showing the effect of AMPA, KA, and DHPG puff application on small diameter neurons (≤ 30 μm) in saline (Sal) vs. morphine (Mor) treated rats. Sustained morphine administration had no effect on AMPA (100 μM, A), KA (100 μM, B) or DHPG (1 mM, C) induced currents in small diameter DRG neurons (≤ 30 μm) or on the percentage of responsive neurons compared with saline treated rats. Integers in each column represent sample numbers.
