DoPep CoThe peptide reading companionA small glossary. A clearer starting point.
Get comfortable with the language of a peptide listing. A few clear definitions can make the next description easier to read.
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A chain of amino acid residues connected by peptide bonds.
01 / THE WORDS IN THE LISTING
6 terms to explore
A peptide is a chain of amino acid residues linked by peptide bonds. The term describes a broad class of molecules; it does not establish the identity, properties, or suitability of any particular catalog material.
Ask for the specific description, not just the category.In a peptide sequence, a residue is an amino acid unit within the chain. Standard one-letter and three-letter symbols identify common amino acids. A sequence records both the residue identities and their order.
A letter belongs to a position in the sequence.The sequence is the order of residues in a chain. Peptide sequences are conventionally written from the N-terminus toward the C-terminus. The same set of residues in another order describes a different sequence.
Preserve the full notation when comparing descriptions.A terminus is an end of the chain. N-terminus and C-terminus identify its two directional ends. Listed terminal modifications add information to the description and should be recorded alongside the sequence.
Check whether the ends are explicitly described.A modification adds chemical detail beyond an unmodified sequence notation. Record the exact wording and its stated position when provided. Do not assume that two similarly named listings have the same modifications.
Missing details are useful follow-up questions.An identifier is a label or reference used to distinguish a material or source. Keep the supplier's catalog reference with your notes so that questions and later reviews can point to the same listing.
A familiar nickname does not replace a specific reference.No matching term. Try sequence, residue, or identifier.
02 / THE MOST USEFUL FOLLOW-UP
Use the glossary to understand the language, then return to the specific description. Record the sequence, listed details, and source. Product-specific questions belong with the supplier; a definition alone does not establish suitability for a study.
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