The future of
single-domain antibodies

Intrabody Selection & Validation

Phage Display & Yeast Two-Hybrid Selection + Intrabody Analysis Process

Are you looking for a recombinant antibody you can express in mammalian cells? Contact us. Hybrigenics selects for you validated intracellular antibodies, also called intrabodies.


  • Basic research: antigen tracking by live cell imaging e.g. video-microscopy and single molecule localization. Functional knockout e.g. antigen retention or addressing to the proteosome pathway (Degradon)

Intrabody Key benefits

  • Enrichment of selected VHHs in intrabodies thanks to yeast selection
  • Intracellular antibodies resistant to cytosol reductive environment
  • Intracellular antibodies recognizing endogenous proteins 
  • Cost-effective production of VHH intrabodies from delivered cDNA clones
  • No variability from batch to batch
  • Versatile tool to use in a vast array of experiments thanks to the possible fusion with Fc fragments from human, mouse or rabbit (see Minibody Cloning & Production)

How does our intrabody selection & validation service work?

To find functional intrabodies, Hybrigenics makes a selection from a synthetic VHH antibody library (hs2dAb) by Phage Display coupled with Yeast Two-Hybrid. Find more technical information on the Phage Display Antibody Selection and Intrabody Enrichment pages. This double screening favors the enrichment in intrabodies that will be functional in cell because we select antibodies that are expressed in the nucleus of the eukaryotic model organism S.cerevisiae.

To validate the intracellular expression of antibodies and the recognition of endogenous antigen, we express both your antigen and pre-selected VHH antibodies in cells as fusions with fluorescent proteins and detect their colocalization by fluorescence microscopy.

For more explanations, do not hesitate to contact our teams.

Material required

For intrabody selection

  • 100 µg of your purified antigen
  • 5 µg of the cDNA of your antigen

For intrabody validation only

  • 5 µg of the cDNA of your antigen


  • Full report containing the selection process description and the fluorescence microscopy data
  • Sequences and cDNA clones of up to 10 VHH intrabodies in the pMCherry vector (mammalian expression)


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