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Anti-CD8a Antibody, clone 1B19, ZooMAb® Rabbit Monoclonal

enhanced validationgreener alternative

recombinant, expressed in HEK 293 cells

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CD8a, T-cell surface glycoprotein CD8 alpha chain, T-lymphocyte differentiation antigen T8/Leu-2

biological source

rabbit (recombinant)

Quality Level


expressed in HEK 293 cells



antibody form

purified antibody

antibody product type

primary antibodies


1B19, recombinant monoclonal

product line

ZooMAb® learn more



mol wt

calculated mol wt 25.73 kDa
observed mol wt ~35 kDa

species reactivity



antibody small pack of 25 μL

greener alternative product characteristics

Waste Prevention
Designing Safer Chemicals
Design for Energy Efficiency
Learn more about the Principles of Green Chemistry.

enhanced validation

recombinant expression
Learn more about Antibody Enhanced Validation


immunocytochemistry: 1:50-1:100
immunofluorescence: suitable using 1:100
immunohistochemistry (formalin-fixed, paraffin-embedded sections): suitable using 1:100
western blot: suitable



UniProt accession no.

greener alternative category

shipped in


storage temp.


target post-translational modification


Gene Information

human ... CD8A(925)

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species reactivity


species reactivity


species reactivity

mouse, human, rat

species reactivity



1B19, recombinant monoclonal


1H4, recombinant monoclonal


1K4, recombinant monoclonal


1B21, monoclonal, recombinant monoclonal

Gene Information

human ... CD8A(925)

Gene Information

human ... CD3E;T3E(916)

Gene Information

rat ... Gria2;Glur2(29627)

Gene Information

human ... VWF;F8VWF(7450)

biological source

rabbit (recombinant)

biological source

rabbit (recombinant)

biological source

rabbit (recombinant)

biological source

rabbit (recombinant)

antibody form

purified antibody

antibody form

purified antibody

antibody form

purified antibody

antibody form

purified antibody

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General description

We are committed to bringing you greener alternative products, which adhere to one or more of The 12 Principles of Green Chemistry.This antibody is Preservative-free, produced without the harm or sacrifice of animals and exceptionally stable to allow for ambient shipping and storage if needed and thus aligns with "Waste Prevention", "Designing Safer Chemicals" and "Design for Energy Efficiency". Click here for more information.
ZooMAb antibodies represent an entirely new generation of recombinant monoclonal antibodies.

Each ZooMAb antibody is manufactured using our proprietary recombinant expression system, purified to homogeneity, and precisely dispensed to produce robust and highly reproducible lot-to-lot consistency. Only top-performing clones are released for use by researchers. Each antibody is validated for high specificity and affinity across multiple applications, including its most commonly used application. ZooMAb antibodies are reliably available and ready to ship when you need them.

Learn more about ZooMAb here.


Clone 1B19 is a ZooMAb rabbit recombinant monoclonal antibody that specifically detects CD8 alpha. It targets an epitope with in 143 amino acids from the extracellular domain.


His-tagged recombinant fragment corresponding to 143 amino acids from the extracellular domain of human CD8 alpha.


Anti-CD8a, clone 1B19 ZooMAb, Cat. No. ZRB1010, is a recombinant Rabbit Monoclonal Antibody that specifically targets T-cell surface glycoprotein CD8 alpha chain and has been tested for use in Immunocytochemistry, Immunofluorescence, Immunohistochemistry (Paraffin), and Western Blotting.
Western Blotting Analysis: A 1:1,000 dilution from a representative lot detected CD8a in THP-1 cell lysate.

Immunofluorescence Analysis: A 1:100 dilution from a representative lot detected CD8a in human tonsil tissue sections.

Immunocytochemistry Analysis: A 1:50 dilution from a representative lot detected CD8a in THP-1 cell line.

Immunohistochemistry (Paraffin) Analysis: A 1:100 dilution from a representative lot detected CD8a in human tonsil tissue sections.

Target description

T-cell surface glycoprotein CD8 alpha chain (UniProt: P01732; also known as T-lymphocyte differentiation antigen T8/Leu-2, CD8a) is encoded by the CD8A (also known as MAL) gene (Gene ID: 925) in human. CD8a is a single-pass type I integral membrane protein with one Ig-like V-type domain (aa 22-135) that plays an essential role in the immune response and serves multiple functions in responses against both external and internal offenses. CD8a is produced with a 21-amino acid signal peptide that is subsequently cleaved to produce the mature form. CD8 is generally present as a heterodimer of alpha and beta chains linked by two disulfide bonds, however, it can also form homodimers. The CD8 alpha/alpha homodimer is expressed on a subset of gamma/delta TCR-bearing T cells, NK cells, intestinal intraepithelial lymphocytes, and lymphoid dendritic cells. CD8a functions primarily as a co-receptor for MHC class I molecule:peptide complex. CD8a is reported to interact simultaneously with the T-cell receptor (TCR) and the MHC class I proteins presented by antigen presenting cells. In NK-cells, the presence of CD8a homodimers at the cell surface provides a survival mechanism allowing conjugation and lysis of multiple target cells. CD8a homodimer molecules also promote the survival and differentiation of activated lymphocytes into memory CD8 T-cells. Cytoplasmic domains of CD8 provide binding sites for the tyrosine kinase lck, facilitating intracellular signaling events that lead to T cell activation, development, and cytotoxic effector functions. CD8+ cytotoxic T cells play an important role in inducing cell death of tumor cells, as well as cells infected by virus, bacteria or parasites. This ZooMAb recombinant monoclonal antibody, generated by our propriety technology, offers significantly enhanced specificity, affinity, reproducibility, and stability over conventional monoclonals.

Physical form

Purified recombinant rabbit monoclonal antibody IgG, lyophilized in PBS with 5% Trehalose, normal appearance a coarse or translucent resin. Contains no biocide or preservatives, such as azide, or any animal by-products. Larger pack sizes provided as multiples of 25 μL.


300 μg/mL after reconstitution at 25 μL. Please refer to guidance on suggested starting dilutions and/or titers per application and sample type.

Storage and Stability

Recommend storage of lyophilized product at 2-8°C; Before reconstitution, micro-centrifuge vials briefly to spin down material to bottom of the vial; Reconstitute each vial by adding 25 μL of filtered lab grade water or PBS; Reconstituted antibodies can be stored at 2-8°C, or -20°C for long term storage. Avoid repeated freeze-thaws.

Legal Information

ZooMAb is a registered trademark of Merck KGaA, Darmstadt, Germany


Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

Storage Class

11 - Combustible Solids




Not applicable


Not applicable

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Long Qin et al.
Science advances, 8(21), eabn3774-eabn3774 (2022-05-26)
The diffuse-type gastric cancer (DGC) is a subtype of gastric cancer (GC) associated with low HER2 positivity rate and insensitivity to chemotherapy and immune checkpoint inhibitors. Here, we identify urokinase-type plasminogen activator receptor (uPAR) as a potential therapeutic target for

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