Side-by-Side Comparison · 2026

Cecropin vs PR-39

Cecropin vs PR-39 — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Cecropin
Antimicrobial Peptide

Cecropins are a family of antimicrobial peptides first discovered in 1980 by Hans Boman in the silkmoth Hyalophora cecropia. Cecropin A was the first AMP characterized from an insect, establishing the paradigm of innate immune peptide-based defense....

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PR-39
Antimicrobial Peptide

PR-39 is a 39-residue proline- and arginine-rich antimicrobial peptide from porcine neutrophil granules. Unlike classical membrane-disrupting AMPs, PR-39 kills bacteria intracellularly by inhibiting DNA and protein synthesis....

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Key Parameters
Parameter Cecropin PR-39
Category Antimicrobial Peptide Antimicrobial Peptide
Research Preclinical Preclinical
Half-Life Minutes (proteolytic) Minutes (proteolytic)
Typical Dose N/A N/A
Frequency N/A N/A
Route Research only Research only
FDA Status Not approved Not approved

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Frequently Asked Questions
What is the difference between Cecropin and PR-39?
Cecropin: Cecropins are a family of antimicrobial peptides first discovered in 1980 by Hans Boman in the silkmoth Hyalophora cecropia. Cecropin A was the first AMP characterized from an insect, establishing the... PR-39: PR-39 is a 39-residue proline- and arginine-rich antimicrobial peptide from porcine neutrophil granules. Unlike classical membrane-disrupting AMPs, PR-39 kills bacteria intracellularly by inhibiting D...
Which has a longer half-life, Cecropin or PR-39?
Cecropin half-life: Minutes (proteolytic). PR-39 half-life: Minutes (proteolytic).
Can you stack Cecropin and PR-39?
Cecropin and PR-39 are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.