# TB-500 (Thymosin Beta-4 Fragment)

> Acetylated LKKTETQ fragment (also called ABP-7) in research vials

All products are sold strictly for laboratory research use only. Not for human or veterinary use.

- Web page: https://peptidemedixeu.com/en/products/tb-500/
- Brand: Peptide Medix EU
- Category: [Tissue Repair & Healing Peptides](https://peptidemedixeu.com/en/collections/tissue-repair-peptides/)
- Purity: ≥99% by HPLC; lot-matched COA available
- CAS number: 885340-08-9
- from €34 (EUR)

## Sizes and prices (EUR)

| Size | Price | SKU |
| --- | --- | --- |
| 2 mg | €34 | TB-500-2-MG |
| 5 mg | €63 | TB-500-5-MG |
| 10 mg | €102 | TB-500-10-MG |
| 20 mg | €182 | TB-500-20-MG |
| 10-vial kit · 10 x 5 mg | €522 | TB-500-10-VIAL-KIT-10-5-MG |

_Catalog prices at build time; the web page and checkout are authoritative._

## Specifications

- **CAS number:** 885340-08-9
- **Molecular formula:** C38H68N10O14
- **Molecular weight:** 889.02 g/mol
- **Amino acid sequence:** Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln (thymosin beta-4 residues 17–23)
- **Chain length:** 7 amino acids, N-terminally acetylated
- **Peptide class:** Thymosin beta-4 fragment; actin-binding domain peptide
- **Form:** Lyophilized powder, sealed glass vial with crimped stopper
- **Purity:** ≥99% by HPLC; lot-matched COA available
- **Available sizes:** 2 mg, 5 mg, 10 mg, 20 mg; 10-vial kit (10 × 5 mg)
- **Storage (lyophilized):** −20 °C, sealed and protected from light and moisture
- **Storage (reconstituted):** 2–8 °C, protected from light, used within the study window
- **Also known as:** ABP-7, Ac-LKKTETQ, thymosin beta-4 fragment 17–23
- **Parent protein:** Thymosin beta-4, a 43-residue G-actin sequestering protein
- **Research areas:** Cell migration, wound closure, angiogenesis, cardiac and corneal repair models

## Description

TB-500 is the acetylated heptapeptide Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln, which matches positions 17–23 of thymosin beta-4. You may also see this exact molecule listed as ABP-7, a name referring to its length as an actin-binding peptide — ABP-7 is simply another name for this product, not a different peptide or an extra SKU.

This fragment isolates the LKKTETQ actin-binding motif from the complete 43-residue protein. We supply it as lyophilised powder in sealed vials of 2 mg, 5 mg, 10 mg and 20 mg, as well as a research kit of 10 vials. Every lot is assayed by reversed-phase HPLC to ≥99% purity with identity confirmed by mass, and the certificate of analysis for your lot is available.

## Frequently asked questions

### What is TB-500, precisely?

A synthetic peptide of seven amino acids, acetylated at the N-terminus, reproducing residues 17 to 23 of thymosin beta-4. Its exact sequence is Ac-LKKTETQ, and it is also sold as ABP-7.

### Are ABP-7 and TB-500 different products?

No — both names refer to the same acetylated heptapeptide, Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln. That's why we don't keep a separate ABP-7 listing alongside this TB-500 product.

### Is TB-500 identical to thymosin beta-4?

No. Thymosin beta-4 is the full protein of 43 residues, while TB-500 is a seven-residue piece of it — far smaller, cheaper to make and easier to handle, but chemically different, and the two don't always behave the same in published studies.

### How do you verify purity, and is there a COA?

Reversed-phase HPLC confirms ≥99% purity for each lot and mass spectrometry verifies the expected molecular mass of 889.02 g/mol. The certificate matching the lot number on your vial can be requested at any time, before or after purchase.

### Which vial size suits my lab?

5 mg fits method development or a single plate experiment; 10 mg covers most short in-vivo pilots; 20 mg is sensible for multi-arm or repeated studies, where opening several small vials would add avoidable handling variability.

### How should I store and reconstitute TB-500?

Keep the powder in its sealed vial at −20 °C. Labs usually dissolve it in bacteriostatic or sterile water — swirl, don't shake — and then keep the solution at 2–8 °C away from light. Aliquot before any freezing so the material isn't thawed repeatedly.

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All products offered on this website are intended solely for in-vitro laboratory research and development by qualified professionals. They are not drugs, foods, cosmetics or dietary supplements, and are not intended to diagnose, treat, cure or prevent any disease. Products must not be introduced into humans or animals in any manner. By purchasing, you confirm that you are a qualified researcher and accept full responsibility for handling and storage in accordance with applicable laws.

Peptide Medix EU · https://peptidemedixeu.com/en/products/tb-500/