Learn peptide science
Free learning for students, educators and independent explorers. Start with a concept, follow a curriculum or practice what you know.
Choose your starting point
Start with the basics
Understand amino acids, peptides and the evidence behind a claim.
Open the free learning path →Structured studyFollow a learning path
Choose a level, read the guides and test your understanding.
Explore the curriculum →Teaching a classUse VALREXA with students
Free resources, self-service study packs and optional customization requests.
For educators →Looking up one concept? Use the scientific glossary or browse reference guides. Research tools are free for everyone.
Biochemistry & biomedical sciences, from associate to PhD
A free four-level curriculum with learning objectives, tools, guides and primary readings, plus degree and career paths.
Associate
Foundations of chemistry and the molecules of life
Level 2Bachelor
Core biochemistry
Level 3Master
Biomedical research methods and peptide therapeutics
Level 4Doctoral
Primary literature and the frontiers of protein science
Unlimited practice problems
A problem generator with new numbers every time, auto-checked answers and worked solutions, in 13 problem types, plus a library of 38 worked problems by course level.
Study guides
Following a typical Biochemistry 1 course. Each has objectives, a worked example, common mistakes and self-check questions.
Amino acids and acid–base chemistry
Structure, classification, pKa, the Henderson–Hasselbalch equation and isoelectric point.
Guide 2The peptide bond and protein structure
How amino acids link up, and the four levels of protein structure.
Guide 3Protein folding and stability
Why sequence determines shape, the forces involved, and what happens when folding fails.
Guide 4Enzymes and kinetics
How enzymes speed reactions, the Michaelis–Menten equation and types of inhibition.
Guide 5Studying proteins and peptides in the lab
Purification, separation, identification, structure determination and peptide synthesis.
Guide 6Peptide hormones and signaling
How peptide hormones are made and act, and how drug designers make them last.
Put peptide evidence into practice
Study LL-37 biofilm and clinical evidence, or CT20p protein-folding and experimental cancer research. Each lesson includes objectives, original readings and self-check questions; independent expert review is still pending.
Antimicrobial peptides & biofilms
Understand infection research without confusing laboratory activity with proven treatment. Start with a plain-language introduction, then explore biofilm structure and study evidence. Independent expert review is pending.
Interactive tools
See the concepts, not just read them.
Peptide calculator
Molecular weight, formula, pI and net charge at any pH.
ExplorerTitration curves
Interactive curves and a full pKa table for all 20 amino acids.
PracticePractice problems
Unlimited auto-checked problems plus 38 worked solutions.
PrintableAmino acid chart (PDF)
One page: codes, classes, pKa, formulas and weights.
Academic resource library
29 free, trusted resources: open textbooks, PubMed, UniProt, the Protein Data Bank, AlphaFold, BLAST and more, each explained.
Browse the library History of scienceLandmark papers
13 discoveries that built protein science, from Michaelis–Menten to AlphaFold, with full citations. Plus the origin story of every peptide in our history timeline.
See the timelineFlashcards
298 cards in 16 decks. Pick a deck below, then tap the card to flip it. Use the arrows to move.
Now studying: All 20
Quiz
Ten questions. Pick an answer to see if you're right.
Keep exploring
The full 20 amino acids reference, the evidence levels explained, and short video explainers.
Put your understanding to work
Choose a next step, at your own pace.