Optimized for use with monoclonal antibody-biotin reagents Av-FITC is provided in a ready-to-use liquid format containing 0.15M NaCl, 25mM HEPES, 0.5% BSA, and 0.1% NaN 3 FITC molecule can be excited by laser light at 488nm and has an optimal emission at wavelength at 525nm Contains sodium azide as a preservative: sodium azide may react with lead and copper plumbing to form explosive metal azides