Fig. 3From: The electroacupuncture-induced analgesic effect mediated by 5-HT1, 5-HT3 receptor and muscarinic cholinergic receptors in rat model of collagenase-induced osteoarthritisThe effects of pretreatment of 5-HT2 receptor agonist (DOI, EA+DOI, n = 10) and antagonist (ketanserin, EA+KTSRN, n = 10) in the CIOA rat treated by 2Â Hz EA (EA+DMSO, n = 10) assessed by TFL (a) and PPT (b). Pretreatment with DMSO, DOI, and KTSRN was performed 20Â min before 2Â Hz EABack to article page