concept

Rabbit cerebellum

Rabbit tongue

Drupaceous fruit from Cotinus coggygria (smoke bush), SEM

Human skin section, histology

Cat lip

Bearded dragon (Pogona vitticeps) skeleton

Cat stomach

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.

Cat tongue, cross section

Mouse nose, transverse section

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Mouse nose, transverse section

Cat lip

Drupaceous fruit from Cotinus coggygria (smoke bush), SEM

Human skin section, histology