Which of the following is not a class of opioid peptides?

Which of the following is not a class of opioid peptides?

Which of the following is not a class of opioid peptides?





  1. Dynorphins
  2. Endorphins
  3. Enkephalins
  4. Endocannabinoids
  5. All of the above are opioid peptides.

Answer: 4