Although they usually come totally clean, sometimes a little membrane surrounds them, and this should be removed.

It may also be injected into the membrane surrounding the lungs.

The brain was lifted out, carefully, for the membranes surrounding it must not be damaged.

At last, the driver cleared his throat, piercing the membrane surrounding them.

If there is any membrane surrounding the kidneys, peel it off and discard.

The membranes surrounding him had shrunk to form- fit against his body, like a baggy suit of clothes.

The blood-brain barrier, a thin membrane surrounding, is effective at keeping out most foreign bodies.

A particular mystery was how large proteins could get through the tightly sealed membranes surrounding the organelles.

Chloroplasts that are the product of secondary endosymbiosis may have additional membranes surrounding these three.

Another more common infection is "meningitis", infection of the membranes surrounding the brain.