• Product name
    Anti-Ki67 antibody [B126.1]
    See all Ki67 primary antibodies
  • Description
    Mouse monoclonal [B126.1] to Ki67
  • Host species
  • Tested applications
    Suitable for: Flow Cyt, IHC-Fr, IHC-P, ICC/IFmore details
  • Species reactivity
    Reacts with: Human, Common marmoset
  • Immunogen

    Other Immunogen Type corresponding to Human Ki67. Raised against nuclear fractions of human tumor cell line



Our Abpromise guarantee covers the use of ab8191 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
Flow Cyt Use at an assay dependent concentration.

ab170190 - Mouse monoclonal IgG1, is suitable for use as an isotype control with this antibody.

IHC-Fr Use at an assay dependent concentration.
IHC-P 1/50. Perform heat mediated antigen retrieval with citrate buffer pH 6 before commencing with IHC staining protocol. The antibody gave good results after 5 minutes of heat-mediated retrieval in a microwave oven.
ICC/IF Use at an assay dependent concentration.


  • Function
    Required to maintain individual mitotic chromosomes dispersed in the cytoplasm following nuclear envelope disassembly (PubMed:27362226). Associates with the surface of the mitotic chromosome, the perichromosomal layer, and covers a substantial fraction of the chromosome surface (PubMed:27362226). Prevents chromosomes from collapsing into a single chromatin mass by forming a steric and electrostatic charge barrier: the protein has a high net electrical charge and acts as a surfactant, dispersing chromosomes and enabling independent chromosome motility (PubMed:27362226). Binds DNA, with a preference for supercoiled DNA and AT-rich DNA (PubMed:10878551). Does not contribute to the internal structure of mitotic chromosomes (By similarity). May play a role in chromatin organization (PubMed:24867636). It is however unclear whether it plays a direct role in chromatin organization or whether it is an indirect consequence of its function in maintaining mitotic chromosomes dispersed.
  • Sequence similarities
    Contains 1 FHA domain.
    Contains 16 K167R repeats.
    Contains 1 PP1-binding domain.
  • Developmental stage
    Expression occurs preferentially during late G1, S, G2 and M phases of the cell cycle, while in cells in G0 phase the antigen cannot be detected (at protein level) (PubMed:6206131). Present at highest level in G2 phase and during mitosis (at protein level). In interphase, forms fiber-like structures in fibrillarin-deficient regions surrounding nucleoli (PubMed:2674163, PubMed:8799815).
  • Post-translational
    Phosphorylated. Hyperphosphorylated in mitosis (PubMed:10502411, PubMed:10653604). Hyperphosphorylated form does not bind DNA.
  • Cellular localization
    Chromosome. Nucleus. Nucleus, nucleolus. Associates with the surface of the mitotic chromosome, the perichromosomal layer, and covers a substantial fraction of the mitotic chromosome surface (PubMed:27362226). Associates with satellite DNA in G1 phase (PubMed:9510506). Binds tightly to chromatin in interphase, chromatin-binding decreases in mitosis when it associates with the surface of the condensed chromosomes (PubMed:15896774, PubMed:22002106). Predominantly localized in the G1 phase in the perinucleolar region, in the later phases it is also detected throughout the nuclear interior, being predominantly localized in the nuclear matrix (PubMed:22002106).
  • Information by UniProt
  • Database links
  • Alternative names
    • Antigen identified by monoclonal antibody Ki 67 antibody
    • Antigen identified by monoclonal antibody Ki-67 antibody
    • Antigen KI-67 antibody
    • Antigen KI67 antibody
    • Antigen Ki67 antibody
    • KI67_HUMAN antibody
    • KIA antibody
    • Marker of proliferation Ki-67 antibody
    • MIB 1 antibody
    • MIB antibody
    • MKI67 antibody
    • PPP1R105 antibody
    • Proliferation marker protein Ki-67 antibody
    • Proliferation related Ki 67 antigen antibody
    • Protein phosphatase 1 regulatory subunit 105 antibody
    • RP11-380J17.2 antibody
    see all


  • ab8191 staining Ki67 in Marmoset colon tissue sections by Immunohistochemistry (IHC-P - paraformaldehyde-fixed, paraffin-embedded sections). Tissue was fixed with formaldehyde and blocked with 1% BSA for 10 minutes at 21°C; antigen retrieval was by heat mediation in citrate acid. Samples were incubated with primary antibody (1/50 in TBS/BSA/azide) for 2 hours at 21°C. A Biotin-conjugated Goat anti-mouse IgG polyclonal (1/300) was used as the secondary antibody.

    See Abreview

  • IHC-P image of ab8191 (1/50) staining human melanoma tumour sections. Secondary antibody: anti-mouse HRP (ab6728).

    See Abreview

  • ab8191 at 1/100 staining normal human primary fibroblasts by ICC/IF. The cells were formaldehyde fixed, permeabilized and fixed before incabation with the antibody for 2 hours at 4°C. An Alexa Fluor ® 488 conjugated donkey polycloanl was used as the secondary.

    See Abreview


This product has been referenced in:
  • Oehl K  et al. Live-Cell Mesothelioma Biobank to Explore Mechanisms of Tumor Progression. Front Oncol 8:40 (2018). Read more (PubMed: 29527515) »
  • Tong WY  et al. Delivery of siRNA in vitro and in vivo using PEI-capped porous silicon nanoparticles to silence MRP1 and inhibit proliferation in glioblastoma. J Nanobiotechnology 16:38 (2018). Read more (PubMed: 29653579) »

See all 29 Publications for this product

Customer reviews and Q&As

Thank you for your enquiry. This antibody should not produce staining in neutrophils. The staining you see may be due to endogenous peroxidase present in neutrophils. Have you tried blocking endogenous peroxidase with H2O2? The protocol we reco...

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1. Ab8191 does recognize human Ki67 and it has been tested in this species, so you can use it on the human islet cells. 2. If the secondary antibody for detecting insulin is FITC labeled (green), then certainly you would need to choose a different f...

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