Figure 6: Relative quantity values of the expression of Gpx1, GAPDH , FMO2, SOD genes in testis and liver, 7 and 28 days after instillation of AgNPs and AgNO3 solution. The data reported in Figure 5 as 2-ΔCt are here expressed as 2-ΔΔCt. This normalization consists in subtracting the ΔCt of control conditions from those of the treated conditions; therefore, all the controls will result 20=1.