The brain has all the characteristics of a gland except one-leaky capillaries-the sturdy brain capillaries are collectively called the 'blood-brain-barrier'. This barrier can easily be demonstrated by injecting a blue dye into an animal; every other organ (except the testicle) turns blue, but the blood-brain barrier keeps the brain as white as snow. (Richard Bergland)

The brain has all the characteristics of a gland except one-leaky capillaries-the sturdy brain capillaries are collectively called the 'blood-brain-barrier'. This barrier can easily be demonstrated by injecting a blue dye into an animal; every other organ (except the testicle) turns blue, but the blood-brain barrier keeps the brain as white as snow.

Richard Bergland

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