USP18 antibody

What it means: Clonality describes how an antibody is produced and how many distinct epitopes it recognizes on the target antigen. A Polyclonal antibody is generated from a pool of B-cell clones, so it binds several different epitopes across the antigen.

Why it matters:

• Polyclonal antibodies typically produce strong, robust signal and tolerate minor antigen denaturation, fixation, or sequence variation between species.
• Recognizing multiple epitopes makes polyclonal reagents forgiving in applications such as Western blot and immunohistochemistry.
• Clonality directly influences assay selection, expected background, reproducibility, and how cross-reactivity should be interpreted in your experiment.

How to interpret here: Because this product is supplied as a Polyclonal antibody, expect broad epitope coverage and dependable detection across its validated applications, while keeping in mind that signal reflects several epitopes rather than one.

Tip: Confirm the validated applications and recommended dilutions, and titrate the antibody in your own system for the best signal-to-noise ratio.

What it means: Host species is the animal in which the antibody was raised. The immune system of the host generates the antibody against the target antigen. This antibody was produced in Rabbit.

Why it matters:

• The Rabbit host determines which secondary antibody is required for detection — the secondary reagent must be an anti-Rabbit conjugate.
• In multiplex or co-staining experiments, the Rabbit host must differ from the host of every other primary antibody to prevent secondary cross-reactivity.
• The host species also influences potential background when staining tissue or cells of the same species, which may require additional blocking.

How to interpret here: Because the host is Rabbit, pair this antibody with an anti-Rabbit secondary conjugate matched to your detection method, and plan panel design so no two primaries share the Rabbit host.

Tip: Keep a record of the host species when designing multi-colour panels to avoid avoidable cross-reactivity artefacts.

What it means: Reactivity lists the species (or antigens) whose target this antibody is documented to detect, based on the supplier's validation data. Documented reactivity here is Human.

Why it matters:

• Reactivity confirms whether this antibody is suitable for your experimental model (Human).
• Species or antigens not listed have not been validated by the supplier and should not be assumed to react without independent confirmation.
• Reactivity often tracks with the sequence conservation of the immunogen region across species.

How to interpret here: You can use this antibody with confidence for the listed reactivity (Human); for any species or antigen that is not listed, run an appropriate positive control to verify epitope conservation before relying on the result.

Tip: Compare the immunogen sequence with your species of interest when planning work outside the documented reactivity.

What it means: Isotype is the immunoglobulin class and subclass of the antibody, determined by its heavy-chain constant region. This antibody has the isotype IgG.

Why it matters:

• The IgG isotype guides selection of an isotype-matched negative control, which is essential for distinguishing specific signal from non-specific binding.
• Isotype affects compatibility with purification chemistries such as Protein A and Protein G, and with isotype-specific secondary reagents.
• In flow cytometry and immunohistochemistry, the IgG isotype control sets the threshold for true positive staining.

How to interpret here: Use an isotype-matched IgG control alongside this antibody so background can be measured and subtracted, giving a reliable estimate of specific signal in your assay.

Tip: Isotype controls are most critical in flow cytometry and IHC, where non-specific Fc binding can otherwise be mistaken for signal.

What it means: This field lists the laboratory techniques for which the antibody has documented, supplier-validated use. The validated applications here are ELISA, Western Blot.

Why it matters:

• Each validated application (ELISA, Western Blot) has its own optimal antibody dilution, sample preparation, and control requirements.
• Validation in a given application means the supplier has confirmed specific detection under those experimental conditions.
• Using the antibody outside the validated applications (ELISA, Western Blot) requires independent optimization and additional controls.

How to interpret here: Select this antibody when your workflow uses one of the listed applications, and follow the recommended dilution provided for each technique.

Tip: Always titrate the antibody in your own samples — optimal dilution can vary with tissue, fixation, and detection system.

What it means: Purity indicates the proportion of the preparation that is the intended antibody, typically assessed by SDS-PAGE or chromatography. This product is specified as ≥95% as determined by SDS-PAGE.

Why it matters:

• A higher purity specification (≥95% as determined by SDS-PAGE) means fewer contaminating proteins, which reduces non-specific background and improves signal clarity.
• Consistent purity supports reproducibility across lots and is important for sensitive quantitative assays.
• Well-purified antibody preparations behave more predictably when optimizing dilutions.

How to interpret here: A purity of ≥95% as determined by SDS-PAGE indicates a well-defined preparation suitable for the validated applications listed for this product.

Tip: Store the antibody exactly as directed to preserve both purity and binding activity over its shelf life.