• Product name

  • Description

    Rabbit polyclonal to Otx2
  • Host species

  • Specificity

    Reacts specifically with 31 kDa Otx2 protein.
  • Tested applications

    Suitable for: IHC-P, WBmore details
  • Species reactivity

    Reacts with: Human
    Predicted to work with: Rat
  • Immunogen

    Synthetic peptide derived from the N terminal domain of human Otx2

  • Positive control

    • This antibody gave a positive siganl in OTX2 Overexpression Lysate.



Our Abpromise guarantee covers the use of ab76748 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
IHC-P 1/50 - 1/200.
WB 1/100 - 1/1000. Detects a band of approximately 37 kDa (predicted molecular weight: 32 kDa).


  • Function

    Probably plays a role in the development of the brain and the sense organs. Can bind to the BCD target sequence (BTS): 5'-TCTAATCCC-3'.
  • Tissue specificity

    Expressed in brain.
  • Involvement in disease

    Defects in OTX2 are the cause of microphthalmia syndromic type 5 (MCOPS5) [MIM:610125]. Microphthalmia is a clinically heterogeneous disorder of eye formation, ranging from small size of a single eye to complete bilateral absence of ocular tissues. Up to 80% of cases of microphthalia occur in association with syndromes that include non-ocular abnormalities. MCOPS5 patients manifest unilateral or bilateral microphthalmia/clinical anophthalmia and variable additional features including coloboma, microcornea, cataract, retinal dystrophy, hypoplasia or agenesis of the optic nerve, agenesis of the corpus callosum, developmental delay, joint laxity, hypotonia, and seizures.
  • Sequence similarities

    Belongs to the paired homeobox family. Bicoid subfamily.
    Contains 1 homeobox DNA-binding domain.
  • Developmental stage

  • Cellular localization

  • Information by UniProt
  • Database links

  • Alternative names

    • CPHD6 antibody
    • Homeobox protein OTX2 antibody
    • MCOPS 5 antibody
    • MCOPS5 antibody
    • MGC45000 antibody
    • Orthodenticle 2 antibody
    • Orthodenticle homeobox 2 antibody
    • Orthodenticle homolog 2 (Drosophila) antibody
    • Orthodenticle homolog 2 antibody
    • Orthodenticle2 antibody
    • Otx 2 antibody
    • otx2 antibody
    • OTX2_HUMAN antibody
    see all


  • All lanes : Anti-Otx2 antibody (ab76748) at 1 µg/ml

    Lane 1 : OTX1 Recombinant Protein
    at 0.1 µg
    Lane 2 : OTX2 Overexpression Lysate at 20 µg

    All lanes : Goat Anti-Rabbit IgG H&L (HRP) preadsorbed (ab97080) at 1/5000 dilution

    Developed using the ECL technique.

    Performed under reducing conditions.

    Predicted band size: 32 kDa
    Observed band size: 37 kDa
    why is the actual band size different from the predicted?

    Exposure time: 8 minutes

    Otx1 Recombinant Protein was used as a negative control. This blot was produced using a 10% Bis-tris gel under the MOPS buffer system. The gel was run at 200V for 50 minutes before being transferred onto a Nitrocellulose membrane at 30V for 70 minutes. The membrane was then blocked for an hour using 5% Bovine Serum Albumin before being incubated with ab76748 overnight at 4°C. Antibody binding was detected using an anti-rabbit antibody conjugated to HRP, and visualised using ECL development solution.


This product has been referenced in:

  • Japp AS  et al. High-resolution genomic analysis does not qualify atypical plexus papilloma as a separate entity among choroid plexus tumors. J Neuropathol Exp Neurol 74:110-20 (2015). Read more (PubMed: 25575132) »
See 1 Publication for this product

Customer reviews and Q&As

1-8 of 8 Abreviews or Q&A


We have added the specific blocking peptide used to produce ab76748 to the catalog. A link for the blocking peptide is given below:
ab156847: https://www.abcam.com/otx2-peptide-ab156847.html

Our blocking protocol is given through the link below:

Read More
Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections)
Mouse Tissue sections (Brain/Pituitary)
Antigen retrieval step
Heat mediated - Buffer/Enzyme Used: Citric Acid
Yes - Triton
Blocking step
BSA as blocking agent for 2 hour(s) and 0 minute(s) · Concentration: 3% · Temperature: 23°C

Abcam user community

Verified customer

Submitted Jun 14 2012


Thank you for contacting us.
I'm sorry to hear that the customer has trouble with this antibody.

The information that was provided by the customer is very helpful to us and I am happy to arrange for a free of charge replacement with ab21990. It will be added to our next shipment to you.

I hope this information is helpful to you. Please do not hesitate to contact us if you need any more advice or information.

Use our products? Submit an Abreview. Earn rewards!

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I am very pleased to hear you would like to accept our offer and test ab76748 in mouse in IHC-P. This code will give you: 1 free primary antibody before the expiration date. To redeem this offer, please submit an Abreview formouse inIHC-Pand include this code in the Additional Comments section so we know the Abreview is for this promotion. Please remember that submission of the Abreview is sufficient for the discount code to become active.

For more information on how to submit an Abreview, please visit the site: www.abcam.com/Abreviews.

Remember, we publish both positive and negative Abreviews on our datasheets so please submit the results of your tests. The code will be active once the Abreview has been submitted and can be redeemed in one of the following ways: 1) Call to place your order and mention the code to our customer service department; 2) Include the code in your fax order; 3) Place your order on the web and enter the promotional code.

Any feedback that you can provide will be greatly appreciated, whether positive or negative. If you have any further questions, please do not hesitate to contact us. We look forward to receiving your Abreview and wish you luck with your research.

The terms and conditions applicable to this offer can be found here: www.abcam.com/collaborationdiscount.

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Thank you for confirming these details and for your cooperation. The details provided enable us to closely monitor the quality of our products. I am sorry this product did not perform as stated on the datasheet and for the inconvenience this has caused. As requested, I have issued a free of charge replacement with the order number . To check the status of the order please contact our Customer Service team and reference this number. Please note that this free of charge replacement vial is also covered by our Abpromise guarantee. Should you still be experiencing difficulties, or if you have any further questions, please do not hesitate to let us know. I wish you the best of luck with your research.

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Thank you for getting back to me with these questions.

I have been under the assumption that you havwe been using ab21190 for your experiments, have you been using ab92515 as well?Based on sequence homology ab92515 will recognize both proteins. The absence of a second band in the image is unresolved but may be due to poor separation or extrememly low levels of Otx1 in the sample.

Using ab21190 the lower band will be Otx2 which, in either isoform, has a lower molecular weight that Otx1. (http://www.uniprot.org/uniprot/P32243&http://www.uniprot.org/uniprot/P32242).

Although ab76748 does not have any western blot images in the datasheet we have been assured that the immunogen used for this has no cross reactivity to Otx1.This product is guaranteed to work in western bloton ​human tissues and is covered by our Abpromise for a period of six months. Since we have been unable to resolve this problem, if you have purchased this product within the last 180 days, I would be happy to either send this replacement antibody or to process a refund. If you could please supply me with your Abcam order confirmation number for the purchase of ab21190 I can begin to process this replacement,

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Thank you for contacting us.

The immunogen for ab92515 shares 100% identity with OTX1, so cross reactivity is predicted.

I hope this information is helpful to you. Please do not hesitate to contact us if you need any more advice or information.

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Thank you for contacting us.

I am sorry that you have found this product unsatisfactory following its recent target refinement. As we discussed on the phone the sequence for ab21990 is shared by both OTX1 and OTX2. It was because of this that we have changed the targets.

We have other products which has been guaranteed to work in WB and ICH on human tissue. One such product is ab76748. According to information that I have recieved form the lab, this antibody is specific to Otx2 only with no cross reactivity with Otx1. The immunogenic peptide was selected from specific domains of Otx2.

Another product I would like to mention is ab92326. The immunogen for this OTX2 antibody shares 81% identity with OTX1, so the antibody is not predicted to cross-react with OTX1. However, it is not guaranteed without testing

I hope this information is helpful to you. Please do not hesitate to contact us if you need any more advice or information.

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