Store › SPY555-Actin 100 stainings Image 1 of 1 SPY555-Actin 100 stainings $1,040.00 Quantity: Add To Cart Added! SPY555-actin is a bright fluorogenic, cell permeable and highly specific live cell probe for fluorescence imaging of actin. SPY555-actin is a bright fluorogenic, cell permeable and highly specific live cell probe for fluorescence imaging of actin.