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Cross-reactivity of Fent-KLH and admixture vaccines to derivatives of fentanyl. The left-hand panel shows the structures of relevant fentanyl analogues. The right-hand panel shows the cross-reactivity of the corresponding fentanyl analogues on a Fent-BSA-loaded sensor chip incubated with pooled and diluted mouse sera from either Fent-KLH or Fent-KLH + Her-KLH from week 5.
