KPL Antibodies & Conjugates BacTrace® Anti-E. coli O121 Species Antibody, DyLight 488-Labeled Material Number 5330-0074 Size 0.5 mg Price Please sign in to view pricing. Inventory Status In Stock Unit EA Details Affinity purified polyclonal antibody to E. coli O121 made in goat is conjugated to fluorophore DyLight 488. Isolated from a serum pool of goats immunized with heat-killed whole cells of E.coli serogroup O121. Product is lyophilized. STEC.