Immunohistochemical observations of methionine-enkephalin and delta opioid receptor in the digestive system of Octopus ocellatus
Keywords: متیونین-انکافالین; Enk, enkephalin; Met-Enk, methionine-enkephalin; Leu-Enk, leucine-enkephalinOctopus ocellatus; Methionine-enkephalin; Delta opioid receptor; Digestive system