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SingleB® Hybridoma Protein Expression

Rabbit SingleB® mAb Discovery Service

The unique ontogenetic mechanism of rabbit B cells has created a high affinity, high specificity and stable rabbit monoclonal antibody (mAb). The affinity level of rabbit mAb at the picomolar level provides higher sensitivity for clinical diagnosis and treatment, and reduces the dosage of antibody while reducing the side effects of drugs. In addition, the excellent recognition ability of small molecular substances and fine epitopes also makes rabbit monoclonal antibodies more and more popular in the development of immunodiagnostic reagents and antibody drugs, especially in immunohistochemistry, tumor detection and targeted therapy.

DetaiBio provides Rabbit SingleB® mAb Discovery Service, without the commercial authorization of rabbit myeloma cells, in which rabbit antigen-specific memory B cells and plasma cells can be directly screened. It only takes 49 days to obtain more than 50 antibodies that have been verified by FACS assay.

Service Features

Highly Efficient

whole process lasts for 1.5 months
100 days less than hybridoma

No Commercialization Restrictions

Direct screening of B cells
No hybridoma commercialization restrictions

“1+1” Double Guarantee

double screening, double guarantee

High Probability

High antibody diversity
Higher probability of discovery of unique epitopes



Stage Ⅰ Animal Immunization
  • Antigen preparation (optional)
  • Animal immunization
  • Valence determination
48 days Premium Package

  • FACS binders >50
  • Ensure sequence diversity
  • Antibody sequence and expression plasmid
  • CoA

Economic Package

  • 10 ELISA positive clones
  • Antibody sequence and expression plasmid
  • Select one strain purified 1 mg antibody
  • CoA
Stage Ⅱ “1+1”Double Screening
  • MBC screening
  • PBC screening
Stage Ⅲ BGE® HTP Expression & Functional Test
  • ELISA Assay
  • FACS Assay
Stage Ⅳ Monoclonal Antibody Gene Sequencing
  • HTP gene screening
Stage Ⅴ Expression and Purification of Recombinant Antibody (optional)
  • Transfection level plasmid preparation
  • Transient transfection expression
  • HTP purification
  • Endotoxin control
For enquiry

Advantages of SingleB®

DetaiBio SingleB®Homologous HybridomaHeterologous HybridomaPhage Library
LimitationHigh technical threshold Rabbit hybridoma commercialization restrictionsPoor stability of heterologous fusionDepending on the correct transcription, translation, folding and assembly of light chains in bacteria
Source of AntibodyMBC & PBCPBCPBCMBC & PBC
Heavy & Light Chain PairingNatural pairingNatural pairingPairing DamageUnnatural pairing
Throughput x DiversityHighLowLowMedium
Timeline48 days5-6 months3-4 months3-4 months
DeliverablesFull length antibody sequence & Recombinant plasmidHybridoma (easy to degenerate)Antibody sequencescFv、Fab、VHH sequence & Recombinant plasmid

Case Study

Rapid Immunization of Rabbits

DetaiBio self-developed immunization method with serum titer greater than 1:100K.

Specific MBC Screening

Specific memory B cells were screened by cell surface marker and antigen.

Antibody Functional Verification

The antibody supernatant was obtained by amplification and HTP expression. ELISA was performed on the supernatants and 31 positive clones were found, with a positive rate of 63.3%.

Antibody Affinity Verification

Rabbit monoclonal antibodies discovered by SingleB® Fast mAb discovery platform shows high affinity.

Advantages of Rabbit mAb

  • Stable Structure: 90-95% of light chains are κ1, κ1 makes the light chain structure more stable.
  • High Affinity: The Kd value of antibody is 10-12M, and its affinity is 100-1000 times that of conventional antibody.
  • Accurate recognition: It recognizes small molecules (< 600 Da), PTM, single amino acid substitution and other subtle epitope changes.
  • Rich Diversity: The non inbred lines propagate, with long affinity maturation time, and the diversity mechanisms of sGC and SHM are combined.
  • Strong Immune Response: it can produce strong immune response to small molecule antigen and hapten.
Unique Antibody Structure

Rabbit IgG has no subclasses, and there are fewer amino acids in the N-terminal and D-E ring, which is easy for molecular cloning and engineering design, and is more suitable for antibody drug development. Rabbit anti 90-95% of light chains are κ 1. There is an in chain disulfide bond between VL and Cl, and the light chain structure is more stable. Rabbit monoclonal antibodies can recognize small molecules, post-translational modifications, single amino acid substitution and other subtle epitope changes, and the specificity of epitope recognition is higher.

Fig1. Schematic diagram of natural rabbit IgG

Note: White part represents light chainκ; Light grey part represents light chain λ; Dark gerypart represents heavy chain; Orange part represents disulfide bond

Unique B Cell Development Mechanism

Rabbits produce antibody libraries through different immune mechanisms from mice and humans, which can produce a strong immune response to foreign antigens, and are also applicable to small molecules and haptens with weak immunogenicity. Human and mice create an anti library through VJ and VDJ gene rearrangement, and then further diversify through somatic hypermutation (SHM). In addition to the SHM mechanism, rabbits can also introduce additional antibody diversity through somatic gene conversion (SGC).

Fig2. Rabbit B cells and antibody library development

Note: GALT: gut-associated lymphoid tissue

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