Figure 3From: Distribution and persistence of pleural penetrations by multi-walled carbon nanotubesLight micrograph of fibrotic granulomas 56 days following MWCNT. Micrograph illustrates the extensive collagen network developed within granulomas that developed following a single 20 μg dose of MWCNT. Section stained with Sirius Red show collagen fibers in red.Back to article page