title: The visual system of the horseshoe crab Limulus polyphemus.
mesh_terms: D000818:Animals; D001097:Arachnida / Q000033:anatomy & histology* / Q000648:ultrastructure; D001369:Axons / Q000648:ultrastructure; D001522:Behavior, Animal; D004847:Epithelial Cells; D004848:Epithelium / Q000648:ultrastructure; D008854:Microscopy, Electron; D008953:Models, Anatomic; D009457:Neuroglia / Q000648:ultrastructure; D009900:Optic Nerve / Q000648:ultrastructure; D010786:Photoreceptor Cells / Q000648:ultrastructure; D010860:Pigments, Biological; D013569:Synapses / Q000648:ultrastructure; D014785:Vision, Ocular
chemical_list: D010860:Pigments, Biological