Exocrine gland
Exocrine gland: A gland that secretes a substance out through a duct. The exocrine glands include the salivary glands, sweat glands and glands within the gastrointestinal tract. The exocrine glands are the “glands of external secretion.”
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- Exogenous
Exogenous: Originating from outside the organism. Insulin taken by a diabetic is exogenous insulin.
- Exon
Exon: The region of a gene that contains the code for producing protein. Each exon codes for a specific portion of the complete protein. Exons are separated by introns, long regions of DNA that have no apparent function. Exons are also called coding DNA.
- Exomphalos-macroglossia-gigantism syndrome
Exomphalos-macroglossia-gigantism syndrome: See: Beckwith-Wiedemann syndrome.
- Exonuclease
Exonuclease: An enzyme that cleaves nucleotide bases sequentially from the free ends of a nucleic acid (DNA or RNA).
- Exopeptidase
Exopeptidase: An enzyme that catalyzes the cleavage of the terminal (last) or next-to-last peptide bond from a polypeptide or protein, releasing a single amino acid or dipeptide. By contrast, an endopeptidase catalyzes the cleavage of then internal peptide bonds within a polypeptide or protein.