You meant a neurohormone receptor agonist (the peptide in question binds the
receptor of that particular neurohormone). To my knowledge, in patients
treated with non-human insulin there have been documented immune reactions
against human insulin. Hope that answers your question.
> What I'm concerned about is that if this agonist is similar enough in
> structure to the real neurohormone, the immune system could be
> confused and start attacking that neurohormone, creating a sort of
> auto-immune disease.