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defensin

   Also found in: Wikipedia 0.01 sec.
defensin /de·fen·sin/ (de-fen´sin) any of a group of small antimicrobial cationic peptides occurring in neutrophils and macrophages.
defensin
[difen′sin]
a peptide with natural antibiotic activity found within human neutrophils. Three types of defensins have been identified, each consisting of a chain of about 30 amino acids. Similar molecules occur in white blood cells of other animal species. They show activity toward viruses and fungi, in addition to bacteria.


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This tree traces the various lineages of defensin molecules that led to the platypus toxin (dark red) as well as the lizard and snake defensin-derived toxins (blue) that probably share a common ancestor.
The expression of tgas118, encoding a defensin in Lycopersicon esculentum, is regulated by gibberellin.
Molecular characterization of two isoforms of defensin from hemocytes of the oyster Crassostrea gigas.
 
 
 
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