Biofunctional Antibodies

LEAF™, Ultra-LEAF™, and GoInVivo™


Our biofunctional antibodies elucidate or affect the cellular functions of interest. These antibodies are quality-tested in-house for in vitro and in vivo functional assays such as blocking, neutralization, or activation. They are available in Low Endotoxin, Azide-Free (LEAF™) and Ultra-Low Endotoxin, Azide-Free (Ultra-LEAF™) formulations. Both are 0.2µm filtered and eliminate unwanted effects from endotoxin and sodium azide (Table 1).


Among our selection of biofunctional antibodies, GoInVivo™ products specialize in targeting immune checkpoint receptors, an important step in soluble factor-based immunotherapy to boost a patient’s own anti-tumor activity to fight cancer cells. GoInVivo™ products are all validated by a functional assay, formulated free of sodium azide, guaranteed pathogen-free based on PCR testing, and offered in bulk quantities (Table 1) at an exceptional price.

Table 1.





Quality Tested by Flow Cytometry

Free of Preservatives

Custom Bulk Sizing

Off-the-shelf Sizes

5 mg – 1 g

100 µg – 100 mg

50 µg, 500 µg

Endotoxin Levels

< 1 EU/mg

< 10 EU/mg

< 100 EU/mg

Functionally Validated*



Pathogen Tested**




* All GoInVivo™ antibodies are validated with in vitro functional assays, and in some cases, in vivo applications. Our Ultra-LEAF™ antibodies are functionally tested for selected targets only.

** All GoInVivo™ antibodies are pathogen free as tested by qPCR for up to 20 pathogens, including Mycoplasma.

Bulk Advantages

For some experiments, like animal models receiving in vivo antibody treatements, large quantities of antibodies can be required. To help researchers with these needs, we provide the ability to buy in large batches, which includes several benefits, including:


  • Outstanding value.
  • Each lot is quality-tested and backed by our 100% guarantee.
  • Bulk orders provided in the Ultra-LEAF™ format (<0.01 EU/µg of protein).
  • Rapid turnaround time.

We also provide custom options for your biofunctional antibodies: 


  • Bulk production from your hybridoma.
  • Custom concentrations available.
  • Custom endotoxin limits.
  • Custom formulation of purified or fluorophore-conjugated antibody.
  • Flexible packaging.

Unravel the Immune System With Biofunctional Antibodies


Accelerate your research on B cells and their roles in mediating immune responses and autoimmune disorders with our novel biofunctional anti-mouse CD20 antibodies. These antibodies serve as a tool to study properties of B cell depletion on tissues, eliminating the need to use genetically modified mice when B cell-deficient animals are needed. 

Ultra-LEAF™ Purified anti-mouse CD20 Recombinant Antibody (clone QA18A73)


Our anti-mouse CD20 recombinant antibody (clone QA18A73) was designed with a mouse isotype for increased in vivo stability and delayed clearance. It shows more sustained B cell depletion over our previous clone, SA271G2.


C57BL/6 mice were retro-orbitally injected with 200 µg of Ultra-LEAF™ purified anti-mouse CD20 (clone SA271G2, black line, N=4), Ultra-LEAF™ purified anti-mouse CD20 recombinant (clone QA18A73, purple line, N=4), or vehicle only (PBS, red line, N=4). Peripheral blood was analyzed at indicated intervals, and average % B cells calculated for each group (measured as % CD19+B220+ cells).

Ultra-LEAF™ Purified anti-mouse CD20 Antibody (clone SA271G2)


Our validation studies show how effectively in vivo administration of monoclonal anti-mouse antibody (clone SA271G2) depletes only the immature B cell subset from bone marrow, but not pre-pro, pro, or pre-B cells.


In vivo administration of mAb SA271G2 depletes immature stage of bone marrow B cells. Bone marrow cells from SA271G2-treated mice or the isotype-treated control group were stained to identify the different B cell subsets. Only the immature B cells (CD19hi/B220hi) were depleted, but not pre-pro, pro, or pre-B cells. Data shown was gated on the lymphoid population.

Likewise, treatment with mAb SA271G2 only depletes the CD20+ cells, without any effect on T cells, macrophages, or other cell types. Moreover, tissue integrity of the spleen was maintained despite the almost complete absence of B cells.

C57BL/6 mice were injected intravenously with 250 μg of Ultra-LEAF™ Purified anti-mouse CD20 (clone SA271G2) (right) or Ultra-LEAF™ Purified rat IgG2b, isotype control (left). At day 7, the mice were sacrificed, and spleens were collected, sectioned and stained for microscopy analysis. CD19 is shown in red, CD3 in cyan, CD169 in green, CD11b in yellow, and F4/80 in blue.


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