Features: Orignial avidin/biotin ABC complex formation. Good sensitivity/Low background. Low cost. Available without ("Standard") or with biotinylated species-specific secondary antibody. Kit Contents: 2 ml Reagent A, 2 ml Reagent B, 1 ml biotinylated goat anti-guinea pig IgG, 3 ml normal goat serum. Kit contains sufficient reagents to stain approximately 1000-2000 sections.