Fig. 2
From: Scientific investigation of crude alkaloids from medicinal plants for the management of pain
a Analgesic effect of extracted crude alkaloids on formalin induced licking response in first phase of the test. Values are mean ± SEM, n = 6, * P < 0.05, ** P < 0.01, *** P < 0.001 significantly different compared with control. b: Analgesic effect of extracted crude alkaloids on formalin induced licking response in second phase of the test. Values are mean ± SEM, n = 6, * P < 0.05, ** P < 0.01, *** P < 0.001 significantly different compared with control