Amylin is the other hormone pancreatic beta cells secrete, and its analogues act through a different receptor family than the GLP-1 drugs. This post covers what amylin is, what cagrilintide changes, why the two classes are studied together, and what the published combination trials actually reported.
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Peptide sequences are written in two notations and certificates use both. This post gives the full amino acid table, explains what the N and C termini mean, how to read modifications like Ac- and -NH2, and how to check a sequence against a stated molecular weight yourself.
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One table with the residue count, molecular formula, molecular weight and PubChem record for every compound in the catalog, pulled from PubChem on 11 September 2026. Plus the expected mass-spectrometry peaks at three charge states and the molar concentration of each catalog vial at three reconstitution volumes.
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One table giving the receptor or molecular target for every compound in the catalog, with the primary paper that established it. Five compounds act at named receptors; the rest work through actin binding, copper delivery, a mitochondrial pathway or as a cofactor. Which is which, and what it means for an assay.
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A reviewer should be able to reconstruct exactly what was in the vial and what reached the assay. That takes eleven facts: supplier, product, lot, purity with method, identity with method, net peptide content, salt form, endotoxin, storage, reconstitution and vehicle. What each one is for, a template paragraph, and what NIH expects for key chemical resources.
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Almost every research peptide is built by solid-phase synthesis, one residue at a time on a resin bead, then cleaved, purified by HPLC and freeze-dried. Each step leaves a characteristic impurity, and each impurity shows up on a specific line of the certificate. The six steps, the yield arithmetic, what a crude chromatogram looks like, and the map between the two.
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Endotoxin is a bacterial residue that survives filtration and freeze-drying and can trigger immune and inflammatory responses in cultured cells on its own. The certificate reports it in endotoxin units per milligram. How the test works, a dilution table for every catalog vial, which cell types care, and when the number matters.
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Every vial in the catalog reconstituted at 1, 2 and 3 mL, with the resulting mg/mL, micrograms per insulin-syringe unit, and the draw for a 250 mcg aliquot. Plus the molar concentration from PubChem weights, and the two vials that need a different approach.
Read the post →The blog covers buying, handling and research-design questions as they come up. The evergreen material lives in the guides: reconstitution, reading a certificate of analysis, storage and stability, one research guide per compound and the glossary.
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