1x eBioscience B Substrate Solution 100 ml1X TMB ELISA Substrate SolutionRUO: For Research Use Only. Not for use in diagnostic procedures. SKU# 00-4201Description: The 1x eBioscience TMB Substrate Solution is a single component, ready-to-use, working solution. This TMB substrate is recommended for Ready-SET-Go! cytokine ELISA reagent sets.