Detecting mouse primary antibodies on rat tissue is notoriously difficult in immunohistochemistry due to high levels of background staining. This is primarily caused by cross-reactivity between anti-mouse secondary antibodies and endogenous rat immunoglobulins, as well as interference from endogenous biotin in rat organs such as liver and kidney. These artifacts make interpretation unreliable and require highly optimized detection systems.

Neostain-1 HRP Mouse-NR DAB: A Targeted Solution

The Neostain-1 HRP Mouse-NR (No-Rat) DAB Detection Kit was specifically engineered to overcome these issues. Its formulation provides excellent specificity for detecting user-supplied mouse primary antibodies directly on rat tissues without cross-reactivity.

Key Features

• No-Rat (NR) adsorption:
  The polymeric HRP-anti-mouse secondary antibody is adsorbed against rat, rabbit, and human serum proteins to eliminate non-specific binding.

• Direct detection via 1-step polymer system:
  The HRP-conjugated polymer binds directly to mouse primary antibodies, eliminating the need for intermediate biotinylated antibodies.

• Compatible with multiple specimen types:
  The kit performs reliably on frozen sections, FFPE paraffin-embedded tissues, and freshly prepared cell smears.

Biotin-Free Technology for Cleaner Background

Because this system is completely biotin-free, it avoids the common problem of non-specific staining caused by endogenous biotin. This is particularly advantageous in rat tissue, where biotin levels can be high. By removing this variable, Neostain-1 yields cleaner, more interpretable staining with significantly fewer artifacts.