Secondary Antibodies

R&D Systems offers a range of secondary antibodies for flow cytometry, immunohistochemistry, and Western blotting. We provide species-specific secondary antibodies that are available with a variety of conjugated labels.

Available Target Species:
  • Chicken
  • Goat
  • Hamster
  • Human
  • Mouse
  • Rabbit
  • Rat
  • Sheep
Available Labels:
  • None
  • Allophycocyanin (APC)
  • Biotin
  • Carboxyfluorescein (CFS)
  • Horseradish Peroxidase (HRP)
  • NorthernLights™
  • Peridinin Chlorophyll Protein Complex (PerCP)
  • Phycoerythrin (PE)

NorthernLights™ Fluorescent Secondary Antibodies

Our NorthernLights fluorescent secondary antibodies are bright and resistant to photobleaching. We are currently offering secondary antibodies recognizing mouse, rat, goat, sheep, and rabbit IgG as well as chicken IgY. These reagents are available with three distinct excitation and emission maxima, making them ideal for multi-color fluorescence microscopy.


Used as a secondary reagent in immunofluorescent assays using biotinylated primary labeling reagents. These products have been optimized for use with biotin-conjugated monoclonal and polyclonal antibodies and are now available conjugated to our NorthernLights fluorochromes.