Avidin/Biotin Blocking Kit BioAssay™ is designed to eliminate background caused by endogenous avidin or biotin-like substances. The kit contains 18ml each of avidin and biotin solutions.||Kit Components:|A4500-14A: Avidin Solution, 1x18ml. Supplied as a liquid, 0.05% sodium azide|A4500-14B: Biotin Solution, 1x18ml. Supplied as a liquid, 0.05% sodium azide||Protocol:|These blocking steps should be performed before the primary antibody incubation step.|1. Apply 100ul (2 drops) of A4500-14A to the tissue.|2. Incubate for 10 minutes at RT.|3. Rinse extensively with PBS.|4. Apply 100ul (2 drops) of A4500-14B to the tissue.|5. Incubate for 10 minutes at RT.|6. Rinse extensively with PBS.|The endogenous avidin/biotin activity is now blocked and the tissue section is ready for immunohistochemical staining.||Storage and Stability:|Store components at 4°C. Stable for 6 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.