IGF-1 LR3: what "LR3" means
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In IGF-1 LR3, "LR3" is shorthand for "Long R3": an arginine (R) substituted at position 3, together with a 13-residue extension at the N-terminus. The result is an analogue of insulin-like growth factor 1 that is 83 amino acids long. This guide sets out the identifiers on our listing and what to check on the documentation.
IGF-1 LR3 at a glance
| Compound | IGF-1 LR3 |
|---|---|
| Synonyms | Long R3 IGF-1, LR3 IGF-1 |
| CAS number | 946870-92-4 |
| Length | 83 amino acids |
| Modifications | Arg substitution at position 3; 13-residue N-terminal extension |
| Supplied form | White lyophilised powder |
| Vial size | 1mg per vial |
What does the name tell you?
Each part of the name describes a structural change relative to the parent molecule. "Long" refers to the extra 13 residues added at the N-terminus. "R3" records that the amino acid at position 3 is arginine. The name therefore works as a short description of how the analogue differs from IGF-1 itself.
The synonyms Long R3 IGF-1 and LR3 IGF-1 are the same material written in a different order, which is worth knowing when comparing supplier labels.
Why is the vial size smaller than other listings?
At 83 residues this is a much larger molecule than the short peptides elsewhere in the catalogue, and the listing supplies it at 1mg per vial accordingly. A longer chain also means a higher molecular mass, so a mass result on a certificate of analysis will look very different from that of a tripeptide or pentadecapeptide. Our listing does not state a molecular weight, so use the batch document for that figure. For a shorter comparison see the BPC-157 guide.
Which listing contains IGF-1 LR3?
| Listing | Format |
|---|---|
| IGF-1 LR3 1mg | One vial, single compound, 1mg |
It is listed as a single-compound vial only. Related materials are grouped under DNA and cell research.
What should the documentation show?
- The compound name and CAS number 946870-92-4 match the vial label.
- An HPLC purity figure for the batch.
- A mass result consistent with an 83-residue chain.
- Appearance recorded as a white lyophilised powder.
Batch documents are on the COAs page. For a reading checklist see how to read a peptide certificate of analysis.
Frequently asked questions
What does LR3 stand for?
LR3 stands for Long R3. It records an arginine substitution at position 3 and a 13-residue extension at the N-terminus.
How many amino acids are in IGF-1 LR3?
The listing states 83 amino acids.
What is the CAS number for IGF-1 LR3?
The CAS number listed is 946870-92-4.
What other names does it go by?
The listing gives the synonyms Long R3 IGF-1 and LR3 IGF-1.
What vial size is listed?
One milligram per vial, supplied as a white lyophilised powder.
All Ascend Research products are sold strictly for laboratory research use only. They are not for human or animal use, and nothing in this article is medical advice.
The Ascend Research team
