Epithelia: Simple squamous – identification

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This is a section from the liver – can you spot the simple epithelium?

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This is another section from the liver – try to spot the simple squamous epithelium.

Hint – the red cells in the middle are red blood cells (erythrocytes) – so they must be in a blood vessel, which is lined with endothelium

Question: what type of cells make up this endothelium?