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A protein produced by the body's immune system, in responce to a particular antigen.

The protein on the outside of a pathogen.

A thick-walled blood vessel used to take blood away from the heart.

The creation of a new organism by just one parent.

An organism feeding by making its own food.

A single cell organism.

The pressure that blood exerts on artery walls.

A tiny blood vessel with walls just one cell thick.

The layer of skin below the epidermis containing: glands,nerves and blood vessels.

Deoxyribonucleic acid.