Figure 2: Percentage inhibition by standard: diclofenac sodium, M4SG: methanol extract 400 mg/kg, M2SG: methanol extract 200 mg/kg, P4SG: petroleum ether fraction 400 mg/kg, P2SG: petroleum ether 200 mg/kg, C4SG: carbon tetrachloride fraction 400 mg/kg, C2SG: carbon tetrachloride 200 mg/kg, D4SG: dichloromethane fraction 400 mg/kg, D2SG: dichloromethane 200 mg/kg, E4SG: ethyl acetate fraction 400 mg/kg, and E2SG: ethyl acetate 200 mg/kg of S. grossus in acetic acid writhing.