Figure 4From: PK20, a new opioid-neurotensin hybrid peptide that exhibits central and peripheral antinociceptive effects The effect of different intrathecal doses of PK20 (0.02, 0.1 nmol) vs. morphine (3 nmol) and with 0.9% NaCl as control. Each column represents mean ± SEM of 6 animals. *p < 0.05; **p < 0.001 versus saline-injected (A, B); *p < 0.05; **p < 0.001 versus morphine.Back to article page