KPL Antibodies & Conjugates BacTrace® Anti-E. coli O121 Antibody, Biotin-Labeled Material Number 5360-0037 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 and conjugated to biotin. Antibody is isolated from a serum pool of goats immunized with heat-killed whole cells of E. coli serogroup O121. Product is lyophilized. STEC.