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Liver of a DEN (Diethylnitrosamine)-treated rat. DEN is a toxic chemical which quickly induces liver cirrhosis followed by HCC (Hepatocellular carcinoma, a primary liver cancer). Cirrhosis is an end result of fibrosis, the scarring of liver tissue. Fibrosis is caused by the overproduction of collagen, a component of the connective tissue forming the liver. To grade the amount of cirrhosis present in a liver sample, collagen is made visible using the dye sirius red. Under polarized light, collagen is observed as the golden to red color as shown in this image.

Mouse nose, transverse section

Cat lip

Drupaceous fruit from Cotinus coggygria (smoke bush), SEM

Human skin section, histology

Cat stomach

Rabbit cerebellum

Rabbit tongue

Bearded dragon (Pogona vitticeps) skeleton

Spiral sweat ducts in skin on the sole of a foot

Cat tongue, cross section

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Mouse nose, transverse section

Cat lip

Drupaceous fruit from Cotinus coggygria (smoke bush), SEM

Human skin section, histology

Cat stomach

Mouse nose, transverse section

Rabbit cerebellum

Rabbit tongue

Rabbit cerebellum

Bearded dragon (Pogona vitticeps) skeleton

Spiral sweat ducts in skin on the sole of a foot

Cat lip

Cat tongue, cross section