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Key Product Details

Validated by


Species Reactivity

Human, Mouse, Rat, Porcine, Avian


Flow Cytometry, Immunoblotting, Immunocytochemistry/ Immunofluorescence, Immunohistochemistry, Immunohistochemistry-Frozen, Immunohistochemistry-Paraffin, Immunoprecipitation, Knockout Validated, Western Blot



Antibody Source

Polyclonal Rabbit IgG


BSA Free


1.0 mg/ml

Product Summary for Ki67/MKI67 Antibody - BSA Free


The immunogen for this KI67/MKI67 Antibody was made using a synthetic peptide from the internal region of Human KI67/MKI67, between amino acids: 1550-1600 [Uniprot: P46013].

Reactivity Notes

Use in Avian reported in scientific literature (PMID:34986451) Ki67/MKI67 Antibody reacted with Mouse (PMID: 22033079), Rat (PMID: 22521325), and Porcine (PMID: 29146772). .




Proliferation Marker







Theoretical MW

359 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.

Scientific Data Images for Ki67/MKI67 Antibody - BSA Free

Immunocytochemistry/Immunofluorescence: Ki67/MKI67 Antibody [NB500-170] - HeLa cells were fixed in 4% paraformaldehyde for 10 minutes and permeabilized in 0.5% Triton X-100 in PBS for 5 minutes. The cells were incubated with anti- NB500-170 at 2 ug/ml overnight at 4C and detected with an anti-rabbit Dylight 488 (Green) at a 1:1000 dilution for 60 minutes. Alpha tubulin (DM1A) NB100-690 was used as a co-stain at a 1:1000 dilution and detected with an anti-mouse Dylight 550 (Red) at a 1:1000 dilution. Nuclei were counterstained with DAPI (Blue). Cells were imaged using a 100X objective and digitally deconvolved.
Knockout Validated: Ki67/MKI67 Antibody [NB500-170] - Detection of Ki67/MKI67 by Simple WesternTM. Simple Western lane view shows lysates of HeLa parental cell line and Ki67 knockout (KO) HeLa cell line. A specific band was detected for Ki67/MKI67 at approximately 320 kDa (as indicated) in the parental cell line, but is not detectable in the knockout HeLa cell line using 20 ug/mL of Rabbit Anti-Ki67/MKI67 Polyclonal Antibody (Catalog # NB500-170). GAPDH is shown as a loading control. This experiment was conducted under reducing conditions and using the 12-230 kDa separation system.
Immunohistochemistry: Ki67/MKI67 Antibody [NB500-170] - Senescent MSPCs are characterized by loss of nestin expression. Double-immunofluorescence images of femoral metaphysis sections from 4-, 6-, 8-, and 12-week-old male Nestin-GFP mice using antibodies against GFP (green) and Ki67 (red). DAPI stains nuclei blue. GP growth plate. PS primary spongiosa. Quantification of the percentage of GFP+ cells that express Ki67. Image collected and cropped by CiteAb from the following publication ( licensed under a CC-BY license.

Applications for Ki67/MKI67 Antibody - BSA Free

Recommended Usage

Flow Cytometry

reported in scientific literature (PMID 34946963)


reported in scientific literature (PMID 24248265)

Immunocytochemistry/ Immunofluorescence





1:50-1:300. Use reported in scientific literature (PMID 22493503)




reported by customer review

Western Blot

1-2 ug/ml
Application Notes
Formalin fixed paraffin embedded tissue sections require high temperature antigen unmasking with 10 mM citrate buffer (pH 6.0) prior to immunostaining. This antibody will not work without optimal antigen retrieval, and is a critical step. NOTE: We suggest an incubation period of 30 minutes at room temperature and to use DAB to stain the protein.
Please Note: Optimal dilutions of this antibody should be experimentally determined.

Reviewed Applications

Read 10 reviews rated 4.3 using NB500-170 in the following applications:

Published Applications

Read 171 publications using NB500-170 in the following applications:

Formulation, Preparation, and Storage


Immunogen affinity purified




BSA Free


0.05% Sodium Azide


1.0 mg/ml


The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.

Stability & Storage

Store at 4C short term. Aliquot and store at -20C long term. Avoid freeze-thaw cycles.

Background: Ki67/MKI67

Ki67 is a nuclear protein associated with proliferation, named after its discovery in a Hodgkin's lymphoma-derived cell line by Scholzer and Gerdes at Kiel University, Germany (1). This proliferation marker is expressed during active phases of the cell cycle (late G1, S, G2 and M), whereas the protein remains undetectable in the G0 phase. Ki67 has two main isoforms with theoretical molecular weights of 319 kDa and 359 kDa. Its abundance is tightly regulated by synthesis and degradation with an estimated half-life of 60-90 min, regardless of its position in the cell cycle. Ki67 has been shown to be involved in ribosomal biogenesis, heterochromatin maintenance, and mitotic chromosome separation (2).

Detection of Ki67 by immunostaining is commonly used as a proliferation marker in solid tumors, as well as certain hematological malignancies (3-5). The Ki67 index, which reports on positive Ki67 stained tumor cell nuclei, has been extensively studied as a prognostic biomarker in cancers such as breast cancer and cervical cancer.


1. Gerdes J, Schwab U, Lemke H, Stein H. (1983) Production of a mouse monoclonal antibody reactive with a human nuclear antigen associated with cell proliferation. Int J Cancer. 31:13-20. PMID: 6339421

2. Starborg M, Gell K, Brundell E and Hoog C. (1996) The murine Ki-67 cell proliferation antigen accumulates in the nucleolar and heterochromatic regions of interphase cells and at the periphery of the mitotic chromosomes in a process essential for cell cycle progression. J Cell Sci. 109:143-153. 1996

3. Karamitopoulou E, Perentes E, Tolnay M, Probst A. (1998) Prognostic significance of MIB-1, p53, and bcl-2 immunoreactivity in meningiomas. Hum Pathol. 29(2):140-5. PMID: 9490273

4. Geyer FC, Rodrigues DN, Weigelt B and Reis-Filho JS. (2012) Molecular classification of estrogen receptor-positive/luminal breast cancers. Adv Anat Pathol. 19(1):39-53. PMID: 22156833

5. Ikenberg H, Bergeron C, Schmidt D, Griesser H, Alameda F, Angeloni C, Bogers J, Dachez R, Denton K, Hariri J, Keller T, von Knebel Doeberitz M, Neumann HH, Puig-Tintore LM, Sideri M, Rehm S, Ridder R; PALMS Study Group. (2013) Screening for cervical cancer precursors with p16/Ki-67 dual-stained cytology: results of the PALMS study. J Natl Cancer Inst. 105(20):1550-7. PMID: 24096620

Long Name

Antigen Identified by Monoclonal Antibody Ki67

Alternate Names

Ki-67, KIA, MIB-1, MKI67, PPP1R105, TSG126, antiKi67, Ki67 ihc, Ki-67 ihc, Ki67 mouse, Ki-67 mouse, Ki67 western blot, Ki-67 western blot

Entrez Gene IDs

4288 (Human); 17345 (Mouse); 291234 (Rat)

Gene Symbol


Product Documents for Ki67/MKI67 Antibody - BSA Free

Certificate of Analysis

To download a Certificate of Analysis, please enter a lot number in the search box below.

Product Specific Notices for Ki67/MKI67 Antibody - BSA Free

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.



View specific protocols for Ki67/MKI67 Antibody - BSA Free (NB500-170):

Immunocytochemistry Protocol

Culture cells to appropriate density in 35 mm culture dishes or 6-well plates.

1. Remove culture medium and wash the cells briefly in PBS. Add 10% formalin to the dish and fix at room temperature for 10 minutes.
2. Remove the formalin and wash the cells in PBS.
3. Permeablize the cells with 0.1% Triton X100 or other suitable detergent for 10 min.
4. Remove the permeablization buffer and wash three times for 10 minutes each in PBS. Be sure to not let the specimen dry out.
5. To block nonspecific antibody binding, incubate in 10% normal goat serum from 1 hour to overnight at room temperature.
6. Add primary antibody at appropriate dilution and incubate overnight at 4C.
7. Remove primary antibody and replace with PBS. Wash three times for 10 minutes each.
8. Add secondary antibody at appropriate dilution. Incubate for 1 hour at room temperature.
9. Remove secondary antibody and replace with PBS. Wash three times for 10 minutes each.
10. Counter stain DNA with DAPi if required.
Immunohistochemistry-Paraffin Embedded Sections

Antigen Unmasking:
Bring slides to a boil in 10 mM sodium citrate buffer (pH 6.0) then maintain at a sub-boiling temperature for 10 minutes. Cool slides on bench-top for 30 minutes (keep slides in the sodium citrate buffer at all times).

1. Wash sections in deionized water three times for 5 minutes each.
2. Wash sections in PBS for 5 minutes.
3. Block each section with 100-400 ul blocking solution (1% BSA in PBS) for 1 hour at room temperature.
4. Remove blocking solution and add 100-400 ul diluted primary antibody. Incubate overnight at 4 C.
5. Remove antibody solution and wash sections in wash buffer three times for 5 minutes each.
6. Add 100-400 ul HRP polymer conjugated secondary antibody. Incubate 30 minutes at room temperature.
7. Wash sections three times in wash buffer for 5 minutes each.
8. Add 100-400 ul DAB substrate to each section and monitor staining closely.
9. As soon as the sections develop, immerse slides in deionized water.
10. Counterstain sections in hematoxylin.
11. Wash sections in deionized water two times for 5 minutes each.
12. Dehydrate sections.
13. Mount coverslips.

FAQs for Ki67/MKI67 Antibody - BSA Free

Showing  1 - 3 of 3 FAQs Showing All
  • Q: Could you please let us know if you have the antibody which may have cross-reactivity to hamster tissue in IHC(paraffin or frozen)? Also, please tell us reference information using your products to hamster tissue.

    A: Thank you for your patience. The only information I was able to gain is that the protein has 61% homology with the chinese hamster. Our lab only recommends use if the % homology is 85% or above so I would not recommend our Ki67 antibodies for your customer. However if they are willing to still test this they would become eligable for our Innovators Reward Program in which they would gain a 50% refund and a 50% discount on a future purchase. All you would need to do is email us at

  • Q: What is the IF protocol which was used to obtain the IF image on the datasheet?

    A: Our lab used our general ICC protocol to obtain the image seen on our website.

  • Q: Is there a clone number for this Ki67 antibody?

    A: This antibody is polyclonal, and thus it does not have a clone number.

Showing  1 - 3 of 3 FAQs Showing All