01 / Molecular architecture
A closer look at the chain.
The LL-37 segment is distinct from the complete precursor in UniProt P49913. Its 37 residues define a specific chain, while terminal chemistry and counterions require separate identification.
- 37-residue reference
- Two opening leucines
- Cathelicidin-derived chain
Reference information: [1][2]. Actual lot identity must be verified separately.
A segment is not the entire precursor.
The LL-37 designation refers to a defined segment. A database page for its precursor can provide context, but the precursor’s full sequence and mass should not be copied into a specification for the smaller peptide.
Keep terminal chemistry explicit.
An amide at the chain ending changes the chemical form. The cited supplier page explicitly names an amide; this guide keeps that qualifier visible without applying it to a Pioneer lot whose terminal form is not documented here.
02 / Read the evidence
Research & analytical context.
UniProt records the precursor and its LL-37 segment. The cited supplier reference describes an amidated form; it does not establish the terminal group or salt form supplied by Pioneer.
The distinction that matters
Do not treat the complete precursor, related fragments and an amidated LL-37 reference as interchangeable materials. Match the supplied form to its own documentation.
03 / From reference to record
Know the lot, too.
A publication describes its own test material. Your lot’s certificate describes what was tested on that lot. Keep the compound name, batch number and reported methods together when reviewing a result.
Identity & composition
Check sequence or chemical form, terminal modifications, counterion and—where relevant—each blend component.
Analytical results
Read purity, content, sterility and endotoxin results as separate measurements. Only call a test passed when the actual report supports it.
Handling & storage notes
Lyophilized material: Store at −20°C; protect from light and moisture.
Follow the material-specific label and supporting storage documentation. These temperatures do not establish a shelf life.
How to store lyophilized peptides04 / Reference questions
A few details, explained.
Does 37 describe the vial size?
No. It describes the reference chain length. The selected vial size is a separate mass in milligrams.
Can a reference sheet replace a batch report?
No. A reference identifies a described chemical form. A batch report must identify the actual lot and state the measurements performed on that material.
05 / Continue reading
Go to the source.
Each source is labeled by its type. External sources are not Pioneer batch certificates.