tokens: Rats were treated with the vehicle ( 2 mL / kg of distilled water and 5 % w / v cellulose , 10 days ) , gum Arabic ( 2 mL / kg of a 10 % w / v aqueous suspension of gum Arabic powder , orally for 10 days ) , or gum Arabic concomitantly with GM ( 80mg / kg / day intramuscularly , during the last six days of the treatment period ) .