title: Fine structure of the iris and associated structures of the skates Raja asterias and R. clavata.
mesh_terms: D000818:Animals; D004721:Endoplasmic Reticulum; D004848:Epithelium; D005399:Fishes / Q000033:anatomy & histology*; D007498:Iris / Q000033:anatomy & histology / Q000166:cytology*; D008854:Microscopy, Electron; D009119:Muscle Contraction; D009454:Neurofibrils; D011680:Pupil / Q000033:anatomy & histology