Research library / Compounds

What is peptide?

A seven-residue analogue of tuftsin, from the same research tradition as its sister peptide.

is a synthetic peptide of seven amino acids: Thr–Lys–Pro–Arg–Pro–Gly–Pro. It extends tuftsin, a natural four-residue peptide, with the same Pro–Gly–Pro tail found in . Prism Labs supplies it as a lyophilized vial.

Prism Labs editorial · Updated October 8, 2026 · 3 min read

Lyophilized vial5mg · 10mg · 99.25% purity$35.99View product

What it is

The sequence is TKPRPGP. The reference record lists the formula C33H57N11O9 and a molecular weight of 751.9 g/mol (PubChem CID 11765600).

Its first four residues are tuftsin (Thr–Lys–Pro–Arg), a peptide first described as a fragment of an antibody heavy chain. The added Pro–Gly–Pro is why papers call it a tuftsin analogue.

Sources: [2] PubChem · reference structure · [3] Current Medicinal Chemistry · 2017

Where it came from

It was developed in Russia in the same research tradition as , and was studied in the early 2000s alongside other short peptides of the tuftsin family.

Later work used gene-expression methods: a 2014 study tracked inflammation-related genes over time, and a 2016 study examined genes involved in GABA signaling.

Sources: [4] Neuroscience and Behavioral Physiology · 2003 · [5] Molecular Immunology · 2014 · [1] Frontiers in Pharmacology · 2016

Lyophilized vial from Prism Labs — Every lot ships with its own certificate of analysis.

What researchers have studied

Most published work is in rodents and cell cultures:

Stress-response behavior in rodent models.
Immune- and inflammation-related gene expression.
Genes involved in GABA signaling.
Brain-network activity, in a 2020 study that also examined .

These are observations in laboratory models. They are not evidence about any use in people.

Sources: [4] Neuroscience and Behavioral Physiology · 2003 · [5] Molecular Immunology · 2014 · [1] Frontiers in Pharmacology · 2016 · [6] Doklady Biological Sciences · 2020

vs

Both are seven-residue synthetic peptides ending in Pro–Gly–Pro. extends tuftsin (TKPRPGP); extends an ACTH fragment (MEHFPGP). Their research literatures differ as much as their parent peptides.

The full comparison, including formats: vs , compared.

Sources: [6] Doklady Biological Sciences · 2020

How it is supplied and stored

ships as a lyophilized (freeze-dried) powder in 5 mg or 10 mg vials. The powder is stable at room temperature in transit. For lab use it is reconstituted with bacteriostatic water such as .

For a vial, concentration is content divided by volume: 10 mg in 2 mL gives 5 mg per mL. The reconstitution calculator handles other combinations.

For storage before and after reconstitution, see how to store lyophilized peptides.

How to verify a batch

Every lot has its own certificate of analysis from an independent lab. Read three results separately:

Identity: confirms the expected compound was detected.
Purity: the share of the measured material that is the intended compound.
Content: the amount measured, compared with the label.

Then match the lot number on your vial or bottle to the report, and use the report’s verification link to confirm it with the testing lab. Step by step: how to read a peptide COA.