Figure 6.

The light micrograph of lung tissues about rats exposed to different dose graphene sheets for 7 days: a control: 0 mg, b 0.1 mg, c 0.25 mg, d 0.4 mg (magnification = ×200).

Wang et al. Nanoscale Res Lett 2011 6:8   doi:10.1007/s11671-010-9751-6