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USABIO is a National High-Tech Enterprise with research, production and sales in one. After 14 years of effort, CUSABIO has become a good partner to researchers through worldwide. We are dedicated to providing 60,000+ validated antibodies, 8,000+ recombinant proteins, 660+ cytokines and thousands of ELISA kits to global customers in the research fields of cancer, cell biology, immunology, neuroscience, epigenetics, etc. All kinds of our products can meet customers’ different demands in various scientific research fields.

As a manufacturer of ELISA kits, Exosome isolation kits, antibodies, proteins and related reagents, our only mission is to provide the best products and related custom service to researchers so that they can have a good starting for the next breakthrough. CUSABIO’s high quality has been guaranteed by many published literatures in all kinds of famous journals, such as Science, Nature, Cell, Developmental Biology, Molecular Cell, Genes & Development, and so on. Now, the publications citing our products has reached more than 4,800, and hundreds of publications are updating every year.

CUSABIO has a sound platform for the development of assay kit, mature antigen-antibody research and development system. Assay kits offered by CASABIO are mainly two types, including ELISA kits and exosome isolation kits. We are proficient in a variety of ELISA technologies such as the double antibody sandwich method, double antigen sandwich method, direct competition ELISA method, indirect competition ELISA blocking method, indirect ELISA method, and other methods. And fine affinity purification technology for the production of Exosome Isolation Kits is also adopted.

Combined with the diagnostic kits development team, we are able to develop the ELISA kits with clinical diagnostic levels and make the quality in the leading place worldwide. Exosomes have been one of the research hotspots in recent years, and the separation technology of exosomes has been constantly updated and improved. After continuous improvement and repeated testing, we also developed high purity, high yield, and high-efficiency exosome isolation kits. CUSABIO now offers a broad range of ELISA kits covering over 6,000 different assay targets and two Cell Supernatant Exosome Isolation Kits. If you are interested in these kits, you can go to the corresponding product page for more details.

CUSABIO offers 60,000+ antibodies that are specific to a variety of species and can be used in multiple applications. Furthermore, the number of CUSABIO antibodies is continuing to grow at a rate of 1000 per year.

As an original manufacturer, CUSABIO designs, produces and validates every antibody in-house. Besides advanced experimental apparatus, CUSABIO antibody line also has a professional technical team, so CUSABIO has succeeded in setting up many technology platforms. At present CUSABIO antibodies could be applied in ELISA, WB, IHC/ICC, IF, IP/Co-IP, ChIP and FC. Please click here to view the catalogue of antibodies.

CUSABIO Protein Expression Platform has established four recombinant expression systems from prokaryotic (E.coli) to eukaryotic (Yeast, mammalian cell and insect baculovirus), and has also built unique in vitro E.coil expression system, which enables us to express transmembrane proteins that are usually quite difficult to express.

We currently have 70 native proteins, 100 small molecule antigens, 320 active proteins, 1000+ recombinant proteins in stock, 5700+ developed recombinant proteins, 10,000+ cDNA clones, 36,000+ transmembrane proteins, 500,000+ semi-customized recombinant proteins. Please click here to obtain more information about proteins.

Custom Service
Given the specificity of each experiment, CUSABIO provides latest and comprehensive custom services to meet customers’request, including phage display service, antibody service, protein service, gene synthesis service and oligo synthesis service. We are very pleased to assist our customers worldwide with all passions and great efforts. Today, CUSABIO is proud to be strong backup for clients.


The CUSABIO team consists of scientists with PhD and Master’s Degrees.

Solves customer problems by email, phone, livechat within 24 hours

Contains over 200 online technical resources

Global Presence More than 90 countries and 150 distributors all over the world

As part of its shared Missions with ALFAGEN, CUSABIO always continues to increase production efficiency and control cost on the premise of quality, so that we can provide you, researchers, products and services at an affordable price.

The company, which has a 100% Risk-Free Performance Guarantee, is at your service with the difference of ALFAGEN.

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