What is a Biosimilar antibody?

Name: Human Siglec-3/CD33 (Research Grade Gemtuzumab Biosimilar) Antibody
Brand: R&D Systems
SKU: MAB9635
Price: 459 USD

A Biosimilar antibody is a non-therpeutic, recombinantly-expressed antibody which has the same sequence as the corresponding therapeutic antibody. It is for research use only. The nomenclature of the Biosimilar antibody includes the name of the therapeutic antibody. For example, Catalog # MAB9577 is called Human EGFR (Research Grade CetuxiMab Biosimilar) antibody.

Human Siglec-3/CD33 (Research Grade Gemtuzumab Biosimilar) Antibody

Catalog #: MAB9635 Datasheet / COA / SDS

Recombinant Monoclonal Antibody For Research Use Only

Catalog #	Availability	Size / Price	Qty
MAB9635-100
MAB9635-SP

Detection of Siglec-3/CD33 on U937 Human Cell Line by Flow Cytometry.

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Human Siglec-3/CD33 (Research Grade Gemtuzumab Biosimilar) Antibody Summary

Species Reactivity

Human

Specificity

Detects human Siglec‑3/CD33 based on Gemtuzumab therapeutic antibody. This non-therapeutic antibody uses the same variable region sequence as the therapeutic antibody Gemtuzumab. This product is for research use only.

Source

Recombinant Monoclonal Human IgG₁ Clone # Hu9a

Purification

Protein A or G purified from cell culture supernatant

Immunogen

Human Siglec‑3/CD33

Formulation

Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.

Endotoxin Level

<0.10 EU per 1 μg of the antibody by the LAL method.

Label

Unconjugated

Applications

Recommended Concentration

Sample

Flow Cytometry

0.25 µg/10⁶ cells

See below

CyTOF-ready

Ready to be labeled using established conjugation methods. No BSA or other carrier proteins that could interfere with conjugation.

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Scientific Data

Flow Cytometry

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Detection of Siglec-3/CD33 on U937 Human Cell Line by Flow Cytometry. U937 Human histiocytic lymphoma cell line was stained with Human Anti-Human Siglec-3/CD33 (Research Grade Gemtuzumab Biosimilar) Monoclonal Antibody (Catalog # MAB9635, filled histogram) or irrelevant antibody (open histogram) followed by APC-conjugated Anti-Human IgG Secondary Antibody (Catalog # F0135). View our protocol for Staining Membrane-associated Proteins.

Reconstitution Calculator

Preparation and Storage

Reconstitution

Reconstitute at 0.5 mg/mL in sterile PBS.

Shipping

The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C

Stability & Storage

Use a manual defrost freezer and avoid repeated freeze-thaw cycles.

12 months from date of receipt, -20 to -70 °C as supplied.
1 month, 2 to 8 °C under sterile conditions after reconstitution.
6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Siglec-3/CD33

Gemtuzumab is a biosimilar directed against the extracellular domain of CD33. This product constitutes the immunogen used for the anti-Idiotype catalog numbers MAB9617 and MAB96171. The biotinylated antibody (catalog number FAB9635B) can be used in flow cytometry or various assay format to measure Siglec‑3/CD33 expression and can be detected by conjugated streptavidin.

Long Name

Sialic Acid Binding Ig-like Lectin 3

Entrez Gene IDs

945 (Human); 12489 (Mouse); 102117580 (Cynomolgus Monkey)

Alternate Names

CD33 antigen (gp67); CD33 antigen; CD33 molecule; CD33; FLJ00391; gp67; myeloid cell surface antigen CD33; p67; sialic acid binding Ig-like lectin 3; Sialic acid-binding Ig-like lectin 3; Siglec3; Siglec-3; SIGLEC3gp67

Product Datasheets

Product Datasheet

COA

SDS

Related Research Areas

FAQs

Does this Biosimilar antibody have the same sequence as the therapeutic antibody?
- The Biosimilar antibody has the same variable region and constant region sequence as the therapeutic antibody.
What is a Biosimilar antibody?
- A Biosimilar antibody is a non-therpeutic, recombinantly-expressed antibody which has the same sequence as the corresponding therapeutic antibody. It is for research use only. The nomenclature of the Biosimilar antibody includes the name of the therapeutic antibody. For example, Catalog # MAB9577 is called Human EGFR (Research Grade CetuxiMab Biosimilar) antibody.

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