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Primary Antibodies
Primary antibodies are antibodies that binds directly to a target antigen, unlike secondary antibodies, which bind to other antibodies. Primary antibodies are core components of immunoassays, such as Western blot, IHC and ELISA. One of the most widely used primary antibody classes is Cluster of Differentiation (CD) antibodies, cell surface antigens that are frequently targeted for cell identification, sorting and isolation applications, such as through fluorescence-activated cell sorting (FACS).
AAT Bioquest offers an extensive collection of purified and pre-conjugated anti-human CD antibodies. These are labeled with iFluor® dyes, phycobiliproteins, and classic fluorophores for flow cytometry and immunofluorescence applications. These ready-to-use conjugates enable efficient multicolor panel design with minimal optimization.
iFluor® — Superior brightness and photostability compared to Alexa Fluor® and classic dyes
ReadiLink™ — Kits for labeling your own primary antibodies with iFluor®, PE, APC, or biotin
Buccutite™ — Kits for labeling your own primary antibodies with PE, APC and other proteins
ReadiLink™ — Kits for labeling your own primary antibodies with iFluor®, PE, APC, or biotin
Buccutite™ — Kits for labeling your own primary antibodies with PE, APC and other proteins
For secondary antibodies and detection reagents, see our Secondary and Tag Antibodies catalog.
Browse Primary Antibodies
Anti-human CD antibodies provide comprehensive coverage of cluster of differentiation markers for immunophenotyping human immune cells. This product group includes purified IgGs of popular clones, making them ideal for custom conjugation and protocol development.
- Validated for flow cytometry and immunofluorescence applications
- Consistent lot-to-lot performance for reproducible results
- Coverage of major T cell, B cell, NK cell, and myeloid markers
iFluor®-conjugated CD antibodies feature AAT Bioquest's proprietary iFluor® dyes for superior brightness and photostability.
- Brighter than equivalent Alexa Fluor® conjugates
- Enhanced photostability for extended acquisition times
- Full spectral coverage from UV to near-infrared
- Ideal for multicolor immunofluorescence microscopy
AF dye conjugates provide drop-in alternatives compatible with existing panel configurations.
- Matched spectral properties to Alexa Fluor® dyes
- Cost-effective alternatives without compromising performance
- Compatible with established compensation settings
PE-conjugated CD antibodies offer maximum brightness for detecting low-abundance markers.
- R-Phycoerythrin provides exceptional brightness
- Ideal for rare cell population detection
- Compatible with 488 nm, 532 nm, and 561 nm excitation
- Available as PE-Cy5 and PE-Cy7 tandems
APC-conjugated CD antibodies enable bright detection with red laser excitation.
- Allophycocyanin for high-sensitivity red channel detection
- APC-Cy7 and APC-iFluor® tandems for far-red emission
- Minimal spectral overlap with PE channel
- Ideal for multicolor panel design
PerCP-conjugated CD antibodies provide additional spectral options for 488 nm excitation.
- PerCP and PerCP tandem conjugates available
- Complements FITC and PE in blue laser panels
- Low spectral spillover for clean compensation
Other CD antibody conjugates include our flow cytometry optimized mFluor™ dyes as well as classic fluorophores like FITC and TRITC.
- Optimized dye-to-protein ratios for consistent brightness
- Compatible with standard flow cytometer configurations
This document (01.0005.211015r2) was last updated on Sat Feb 28 2026. All trademarks and registered trademarks mentioned herein are the property of their respective owners.