Tubulin Tracker Green (Oregon Green 488 Taxol, diacetate) greens polymerized tubulin in living cells Fluorescent staining. Tubulin Tracker Green is an uncharged, non-fluorescent compound that readily crosses the plasma membrane of living cells. After the dye enters cells, non-specific esterases cleave the lipophilic blocking group to form a charged green fluorescent product, preventing it from escaping from living cells. Tubulin Tracker Green reagent uses Oregon Green 488 dye, whose optimal absorption and emission wavelengths are 494 nm and 522 nm, and fluorescence can be displayed using almost all fluorescence imaging instruments through standard GFP/FITC filter settings. Can be combined with blue, orange, red, deep red and near-infrared fluorophores.