We deliver high-quality recombinant proteins and enzymes that accelerate therapeutic development...
...offering a comprehensive catalog where versatility meets quality
3000+ Catalog Products
Over 3000 recombinant proteins carefully selected based on quality and research needs.
Tailored Expression Systems
Proteins tested in 8-16 various expression conditions to determine the optimal settings.
High Purity & Bioactivity
Rigorous quality control testing for purity and bioactivity using HPLC, SPR, ELISA, etc.
Next-Day Shipping from Boston, MA
Catalog products shipped next-day from our inventory center in Boston, MA.
Target Antigens for Drug Discovery
Bioactive target antigens for drug discovery campaigns.
Proteins for Drug Discovery
Gene Editing Products
GMP-Grade gene editing enzymes and AAV Titration ELISA Kits.
Gene Editing Enzymes
Multi-Pass Transmembrane Proteins
MHC Monomers & Tetramers
Class I & Class II MHC-Peptide Complexes
MHC-peptide
MHC Monomers & Tetramers from mammalian & E. coli expression systems
Peptide-ready MHC
Load your own peptide in-house for a custom monomer or tetramer
Biotinylated MHC
Biotinylated MHC monomers or tetramers for TCR screening and more
Fluorescent MHC
Identify antigen-specific T Cells using FACS
GMP Gene Editing Enzymes
Trending Products
AAV Titration ELISA Kits
AAV Titration ELISA Kits
Quantification of AAV capsids for serotypes 2, 5, 6, 8, or 9 with high specificity to individual AAV serotypes, high sensitivity, and a broad linear range.
AccuBase® Base Editor
AccuBase® Base Editor
GMP-Grade. Precise DNA cytosine base editor with minimal off-target effects, creating C->T mutations for gene knockout without DNA breaks.
CD19 Proteins
CD19 Proteins
Mammalian-expressed human CD19 proteins with high monomer rates. Various spcies and fluorescent options. In-stock catalog products.
Upcoming Events
Festival of Biologics US
April 23-25, 2025
San Diego, California
Booth #1123
AACR Annual Meeting
April 27-30, 2025
Chicago, Illinois
Booth #3935
PEGS Summit
May 12-16, 2025
Boston, MA
Booth #801
News & Articles
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60 Hickory Drive
Waltham, MA 02451
United States
KACTUS | Quality Recombinant Proteins and Enzymes