Jackson Immuno Research Inc.
specializing in secondary antibodies and conjugates

Find By Code Number

Product Filter

Spotlight on...

Fluorescent Dyes

Brilliant Violet™
421 & 480

  • Combine with AF488, RR-X, & AF647 for 5-color imaging
  • Compatible with commonly used filter sets
  • Switch nuclear stain from DAPI to DRAQ5™ for additional labeling options

Learn More

Whole IgG Affinity-Purified Secondary Antibodies

"Without question, I can always turn to Jackson ImmunoResearch secondary antibodies for ECL detection of any primary antibody! They produce great signal at low dilutions."

W Thompson, OSHU

Leave a Review

Share your results...

Cite & Win!

Using our products?
About to publish?
Share your images with us!

Let us know!

Monovalent Fab Fragments for Double Labeling - Example C

Technical Service e-mail
tech@jacksonimmuno.com

Fab Fragments for Blocking and Double Labeling of Primary Antibodies from the Same Host Species

Example C. Use of unconjugated Fab fragments for blocking after the first secondary antibody

figure 1

figure 1 

  1. Incubate with the first primary antibody, in this example Rabbit Anti-Antigen X. Wash.

  2. Incubate with Probe I-conjugated secondary antibody, in this example Alexa Fluor® 488-Goat Anti-Rabbit IgG (H+L) (min X Hu, Ms, Rat Sr Prot). Wash.

  3. Incubate with normal serum from the same host species as the primary antibodies, in this example normal rabbit serum. The purpose of this step is to saturate open binding sites on the first secondary antibody with IgG so that they cannot capture the second primary antibody. Wash.

  4. Incubate with an excess of unconjugated Fab antibody against the host species of the primary antibodies, in this example Fab Goat Anti-Rabbit IgG (H+L).The host species of the Fab antibody should be the same as the host species of the conjugated secondary antibody. This step covers the rabbit IgG so that the second secondary antibody will not bind to it. Wash.

  5. Incubate with the second primary antibody, in this example Rabbit Anti-Antigen Y. Wash.

  6. Incubate with Probe II conjugated to the same secondary antibody as used in step 2, in this example Rhodamine Red-X-Goat Anti-Rabbit IgG (H+L)(min X Hu, Ms, Rat Sr Prot). Wash.

Browse Monovalent Fab Fragments