“2 In rats pretreated … of 50 mg capsaicin over 4 days, … capsaicin, formalin, HCl, KCl , prostaglandin E1, bradykinin and bradykinin with prostaglandin E1 (10−6 m) were greatly reduced, the responses to …‐hydroxytryptamine were slightly reduced and those to adenosine 5′‐triphosphate (ATP) and compound 48/80 were unaffected.”