Fig. 7From: Differential activation of RAW 264.7 macrophages by size-segregated crystalline silicaTNF-α expression after 2-h exposure to four sizes of Crystalline Silica, showing that for a 2-h exposure period each particle size creates a significant increase in expression of TNF-α when compared to the negative control; however, there was no significant difference on the expression of TNF-α based on particle sizeBack to article page