title: Unusual distribution of neurons in the pike pineal organ.
mesh_terms: D000818:Animals; D005399:Fishes / Q000033:anatomy & histology*; D009474:Neurons / Q000166:cytology / Q000648:ultrastructure; D010786:Photoreceptor Cells / Q000166:cytology / Q000648:ultrastructure; D010870:Pineal Gland / Q000166:cytology*