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Acetic Acid-Induced Writhing Test. This test was conducted
according to the description published by Koster et
al. [24]. The presence of abdominal contortions induced by
an intraperitoneal injection of acetic acid was considered
nociceptive behavior, characterized by abdominal muscle
contractions followed by stretching of the hind limbs [25,
26]. For this experiment, groups of 8 mice received the
following types of pretreatment: vehicle, phytol at the doses
of 25, 50, 100, and 200mg/kg, indomethacin (10mg/kg),
or morphine (10mg/kg). Thirty minutes after pretreatment,
the animals received intraperitoneal injections of a 0.85%
solution of acetic acid (0.1 mL