title: Pineal-gonad relationships in the lamprey Lampetra fluviatilis.
mesh_terms: D000818:Animals; D005260:Female; D005399:Fishes / Q000502:physiology*; D006066:Gonads / Q000254:growth & development*; D008297:Male; D010870:Pineal Gland / Q000502:physiology*; D012727:Sex Characteristics