the skin and hair. Meibomian glands in the eyelid secrete meibum to lubricate and protect the eye.

In gram-negative bacteria

Secretion is not unique to eukaryotes - it is also present in bacteria and archaea as well. ATP binding cassette (ABC) type transporters are common to the three domains of life. Some secreted proteins are translocated across the cytoplasmic membrane by the

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