Milli-Mark® ChromaPan Neuronal Marker-ORC

Milli-Mark ChromaPan Neuronal Marker-ORC is an antibody targeting the ORC protein, validated for use in ICC & IF.


Quality Level



species reactivity

human, rat, mouse




immunocytochemistry: suitable
immunofluorescence: suitable

shipped in

wet ice

General description

The Milli-Mark ChromaPan Neuronal Marker-ORC is a complete multi-species neuronal antibody blend with an open rabbit channel (ORC) that specifically detects axons, dendrites, and cell bodies with different fluorophores. The Multi-species Primary Antibody blend does not have a rabbit IgG; this allows the researcher to colocalize their own rabbit IgG (against their target protein) to the neuronal cytoarchitecture.

Antibodies to neuronal proteins have become critical tools for identifying neurons and discerning morphological characteristics in culture and complex tissue. Neuron-specific antibodies are convenient precision tools useful in revealing cytoarchitecture, but are limited to the protein target distribution within the neuron, which may differ greatly from nucleus to soma to dendrite and axon. To achieve as complete a morphological staining as possible across all parts of neurons, Millipore has developed a multi-species primary antibody blend that reacts against key somatic, dendritic, and axonal proteins distributed across the neuronal architecture that can then be detected by a single multi-species secondary antibody blend containing discrete fluorophores. As a result, different morphological features (somatic, dendritic, and axonal) are illuminated in different colors: The somato-dendritic cytoarchitecture is detected with DyLight 488 conjugated secondary, and the somato-axonal cytoarchitecture is detected with DyLight 649 conjugated secondary antibody. The primary antibody blend does not contain any rabbit IgGs. The researcher can add a rabbit IgG against their target protein which can be detected with the secondary antibody blend provided by a cyanine 3 conjugated secondary against Rabbit IgG. This pan-neuronal antibody cocktail has been validated in a variety of cell and tissue cultures, giving researchers a convenient and specific qualitative and quantitative tool for studying neuronal morphology.


Reactivity with other species has not been determined.
NS340 is specific to axons, dendrites including spines, and the cell body of neurons.


Epitope: Whole Neuron Marker


Research Sub Category
Neuronal & Glial Markers
Immunocytochemistry Protocol
1. Culture neurons as desired. When ready, gently wash with PBS and fix cells with 4% paraformaldehyde in PBS, 5-15 min at room temp (RT).
2. Wash with PBS, 3 x 5min each, at RT and block with 1X blocking buffer for 1 hr at RT.
Note: The blocking buffer provided is supplied as a 5X concentrate. Dilute the concentrate to 1X strength using Milli-Q water. For example, add 20 ml of Milli-Q water to 5 ml of 5X blocking buffer.
3. Incubate cells with ChromaPan Multi-species Primary Antibody blend for 2hr at RT (dilute antibody 1:125 to 1:250 in blocking buffer). Optimal working concentrations must be determined by the end user.
Optional: Rabbit IgG against target protein can also be added to the ChromaPan primary antibody mixture. Optimal working conditions must be determined by the end user. If rabbit IgG is added skip step 4.
4. Wash with PBS, 3 x 5min each, and incubate cells with rabbit IgG against target protein. Optimal working conditions must be determined by the end user.
5. Wash with PBS, 3 x 5min each, and incubate cells with Multi-species Secondary Antibody blend (1:150 in blocking buffer) for 1hr at RT (validated with Chroma Pan to produce minimal background). Optimal working concentrations must be determined by the end user.
Optional: DAPI (1:1000) can also be added to the secondary mixture. If DAPI is added skip step 6.
6. Wash with PBS, 3 x 5min each, and incubate cells with DAPI (1:1000 in blocking buffer) for 5min at RT. Optimal working concentrations must be determined by the end user.
7. Wash with PBS, 3 x 5min each, and cover slip with LIGHT DIAGNOSTICS Mounting Fluid (Catalog No. #5013). View using fluorescent microscope with appropriate filter.

Research Category


1) 5X Blocking Buffer (Part No. CS204291): 5 ml of an optimized blocking buffer is provided and contains PBS, BSA, serum, trition X-100, and 0.05% azide. Store at 2-8°C.

2) Multi-species Primary Antibody blend (ORC) (Part No. CS204300): 100uL of a proprietary antibody blend with host specific antibodies that reacts against key somatic, nuclear, dendritic and axonal targets. It does not contain rabbit IgG. Presented in PBS containing 0.05% azide. Store at 2-8°C.

3) Multi-species Secondary Antibody blend (Part No. CS204289): 100 µL of a secondary antibody blend containing host specific IgG antibodies against mouse, rabbit, and chicken, conjugated to DyLight 488, cyanine 3, and DyLight 649 dyes respectively. Each individual set has been species absorbed against H, R, B, Gt, Sh, Gp, Eq and/or M, Rb, Ch to minimize background and cross reactivity. Presented in 0.01M Sodium Phosphate, 0.25M NaCl, pH 7.6 with 15 mg/mL BSA, and 0.05% sodium azide. Store at 2-8°C, away from light.

4) DAPI (Part No. CS202687): Vial contains 10 µL of 0.1mg/mL of DAPI. Store at 2-8°C, away from light.


Routinely tested on rat E18 cortex primary neurons in Immunocytochemistry 1:150 - 1:100.

Physical form

Format: Purified
Blended polyclonal antibody cocktail in PBS with 0.05% NaN3.

Storage and Stability

Maintain at 2-8°C for up to 6 months from date of receipt.

Analysis Note

Cortical neurons

Legal Information

MILLI-MARK 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.


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Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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