A peptide name may not tell a reader which residue sequence entered an experiment. Publication reporting should make the sequence intelligible and identify the evidence behind it, especially when a fragment, analogue or particular isoform is relevant to the study.
Describe the construct rather than only its family
EMBL-EBI’s UniProt training explains that an entry can display a representative canonical sequence alongside isoforms. Consequently, a protein name or broad database reference may need a more precise sequence selection when used to describe a research construct.EMBL-EBI — UniProt: Sequence and Isoform (opens in a new tab)
For a synthetic fragment, state the actual residue sequence and, where relevant, its relationship to the referenced parent. A residue range is interpretable only if the parent sequence and numbering basis are clear.
An original example might describe a construct as “the five-residue sequence AGSKL, written from the N-terminus to the C-terminus”. This is an illustrative sequence string, not a claim about a named commercial peptide.
If the construct differs from a reference sequence, describe the difference explicitly. A reader should not need to infer a substitution by comparing an unexplained molecular mass with a database entry.
Make the sequence readable without guessing
| Field | Purpose |
|---|---|
| Residue order | Identify the complete chain in a stated direction |
| Notation | Define any nonstandard symbols or residue abbreviations |
| Reference mapping | Identify the parent record, isoform and residue range where applicable |
| Identity provenance | State whether the sequence is intended, supplier-declared or experimentally assessed |
Keep a machine-copyable text representation where possible. A low-resolution image of a sequence can introduce transcription mistakes or make unusual residues difficult to distinguish.
For nonstandard residues or stereochemistry, give an unambiguous definition. A familiar single-letter code may be insufficient to describe a modified or differently configured residue.
Terminal groups, linkages and labels also affect the complete molecular form. Report them alongside the sequence rather than expecting the plain residue string to carry information it does not explicitly encode.
Attribute the sequence statement accurately
If the supplier specification declares a sequence, say so and identify the relevant document. If the study performed sequence-related analysis, describe what was measured and what that evidence distinguishes.
A matching calculated mass can support some aspects of a proposed identity without uniquely establishing residue order or every structural feature. Avoid upgrading limited evidence into a claim that the entire sequence was independently confirmed.
Where the sequence was not disclosed, report that limitation rather than inserting a sequence from a similarly named product. A complete-looking but unsupported sequence description is less informative than an explicit gap.
Check the sequence across the publication package
Compare the main text, methods table, supplementary files and deposited metadata for residue-order and identifier consistency. A single transposed symbol can create a different construct description.
Retain the reference version or retrieval context used for any database mapping. Later changes to a record should not make the historical sequence description impossible to reconstruct.
The finished account should let readers identify the construct and assess the strength of its identity evidence separately. That distinction is more useful than either a bare product nickname or an overstated confirmation claim.
Sources and further detail
- EMBL-EBI — UniProt: Sequence and Isoform (opens in a new tab)
Official training page checked for canonical and isoform sequence display. The reporting examples are original and do not assert identity of a physical research reagent.
Sources checked 20 September 2026. Reporting examples are illustrative unless explicitly identified as supplied-document transcriptions. This article has not undergone independent scientific peer review.