Table 1.

Experimental animal groups

Groups	Definition	Dose	Abbreviated name	n
Control	Non-sensitized rats		C	6
Sensitized	Non-treated, OA sensitized rats		S	6
	Treated with alpha linolenic acid (ALA)	0.2 mg/ml 0.4 mg/ml	S+ALA 0.2 mg/ml S+ALA 0.4 mg/ml	4 4
	Treated with Dexamethasone	1.25 μg/ml	D	6

Alpha linolenic acid (Sigma-Aldrich, Darmstadt, Germany), and dexamethasone (Sigma, purity; 97%) were added in drinking water of animals during sensitization period. Each rat in all groups averagely drank 40 ml/day drinking water which wasn’t significant difference among different groups. The animals of groups C and S were given drinking water alone.