In collaboration with Nexins Research BV, we provide the best and brightest annexin V conjugates available, including this Alexa Fluor™ 555 annexin V conjugate. Highly fluorescent annexin V conjugates provide quick and reliable detection methods for studying the externalization of phosphatidylserine, one of the earliest indicators of apoptosis. The orange-fluorescent Alexa Fluor™ 555 dye produces conjugates that are considerably brighter than Cy3 conjugates, with excitation/emission maxima of ~555/565 nm.