The AlphaLISA® SureFire® Ultra™ p-STAT5 (Tyr694/699) HV (high volume) assay is a sandwich immunoassay for quantitative detection of phospho-STAT5 (phosphorylated on Tyr694/699) in cellular lysates using Alpha Technology. This kit replaces ALSU-PST5-A-HV. ALSU-PST5-A-HV is no longer available as the antibody(ies) have been discontinued by the supplier. A new antibody pair has been selected and validated to make this new version, with a similar or slightly improved performance over the initial version. Comparative data are included in the manuals of the new kits.