The living science of peptides
Structure, classification, synthesis, and therapeutics — with interactive tools that make biophysics feel tangible.
For educational and research purposes only · Not medical advice
Research peptide guides
Deep educational profiles for the compounds people search every day — then continue to the catalog when you are ready.
Three ways in. Zero fluff.
Skip the endless scroll. Pick how you want to engage with peptide science.
Learn the science
From the peptide bond to biosynthesis — a clear path through the fundamentals.
Explore the Atlas
Browse notable peptides — hormones, neuropeptides, antimicrobials — with sequences and stories.
Play with tools
Sequence playground, length explorer, property estimators — learn by doing.
See a sequence come alive
Residue chemistry, hydrophobicity profile, mass, charge, and pI — updated as you type.
Sequence → properties
Type a one-letter sequence. Watch hydrophobicity, charge, mass, and residue chemistry update in real time.
Educational approximations using average residue masses and standard pKa tables. Real peptides depend on termini, modifications, and experimental conditions.
How long is a peptide?
The peptide–protein boundary is conventional, not absolute. Drag the slider to see how length maps to oligopeptide, polypeptide, and protein territory.
Explore peptide types →Peptide Length Explorer
Short bioactive peptides such as hormones and neuropeptides (e.g. oxytocin).
Note: The boundary between peptides and proteins is not strict and varies by field.
Ready to go deeper?
Start with high-intent peptide profiles or the fundamentals.