title: Absence of efferents to the retina in the frog and toad.
mesh_terms: D000818:Animals; D001001:Anura; D001369:Axons / Q000648:ultrastructure; D002024:Bufo marinus; D004525:Efferent Pathways / Q000033:anatomy & histology; D006735:Horseradish Peroxidase; D009900:Optic Nerve / Q000033:anatomy & histology; D011894:Rana pipiens; D012160:Retina / Q000033:anatomy & histology*; D013477:Superior Colliculi / Q000033:anatomy & histology; D013495:Supraoptic Nucleus / Q000033:anatomy & histology
chemical_list: D006735:Horseradish Peroxidase