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Anti-Rb Antibody, clone 2M15 ZooMAb® Rabbit Monoclonal

enhanced validationgreener alternative

recombinant, expressed in HEK 293 cells

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Rb, Retinoblastoma-associated protein, p105-Rb, p110-RB1, pRb, pp110

biological source

rabbit (recombinant)

Quality Level


expressed in HEK 293 cells



antibody form

purified antibody

antibody product type

primary antibodies


2M15, recombinant monoclonal

product line

ZooMAb® learn more



mol wt

calculated mol wt 106.16 kDa
observed mol wt 120 kDa

species reactivity

human, mouse, rat


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


affinity binding assay: suitable
immunocytochemistry: suitable
immunohistochemistry (formalin-fixed, paraffin-embedded sections): suitable
western blot: suitable



UniProt accession no.

greener alternative category

shipped in


Storage temp.


target post-translational modification


Gene Information

human ... RB1(5925)

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 2M15 is a ZooMAb rabbit recombinant monoclonal antibody that specifically detects Retinoblastoma-associated protein (Rb). It targets an epitope within the C-terminal region.


His-tagged recombinant fragment corresponding to 158 amino acids from the C-terminal region of human Retinoblastoma-associated protein (Rb).


Anti-Rb, clone 2M15 ZooMAb, Cat. No. ZRB1014, is a recombinant Rabbit monoclonal antibody that targets Retinoblastoma-associated protein and is tested Affinity Binding Assay, Immunocytochemistry, Immunohistochemistry (Paraffin), and Western Blotting,
Western Blotting Analysis: A 1:1,000 dilution from a representative lot detected Rb (Retinoblastoma associated protein) in HeLa, and NIH3T3 cell lysates.

Immunocytochemistry Analysis: A 1:100 dilution from a representative lot detected Rb (Retinoblastoma associated protein) in HeLa, A431, HepG2 and NIH 3T3 cells.

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

Affinity Binding Assay: A representative lot of this antibody bound recombinant Rb (Retinoblastoma associated protein) with a KD of 2.6 x 10-7 in an affinity binding assay.

Note: Actual optimal working dilutions must be determined by end user as specimens, and experimental conditions may vary with the end user

Target description

Retinoblastoma-associated protein (UniProt: P06400; also known as p105-Rb, p110-RB1, pRb, Rb, pp110) is encoded by the RB1 gene (Gene ID: 5925) in human. Retinoblastoma (Rb) proteins act as a negative regulator of cell cycle and controls the passage of cells from G1 to S phase. It I a key regulator of entry into cell division that acts as a tumor suppressor. It acts as a transcription repressor of E2F1 target genes. In its underphosphorylated, active state it interacts with E2F1 and represses its transcription activity, leading to cell cycle arrest. Its action is regulated by phosphorylation of several serine and threonine residues on the protein. Phosphorylated Rb protein sequesters transcription factors allowing the transition from G1 to S phase. It is phosphorylated by CDK6 and CDK4, and subsequently by CDK2 at serine 567 in G1, thereby releasing E2F1 which is then able to activate cell growth. It is dephosphorylated in the late M phase. Phosphorylation at threonine 821 and 826 promotes interaction between the C-terminal domain and the Pocket domain (aa 373-771), and thereby inhibits interactions with heterodimeric E2F/DP transcription factor complexes. Mutations in Rb1 gene are known to cause childhood retinoblastoma, a malignant tumor that arises from the nuclear layers of the retina. 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 lyophilized from 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.


0.03 mg/mL after reconstitution at 25 μL per vial. 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

13 - Non Combustible Solids




Not applicable


Not applicable

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