title: The fine structure of the vascular system of Amphioxus: implications in the development of lymphatics and fenestrated blood capillaries.
mesh_terms: D000818:Animals; D001011:Aorta / Q000166:cytology; D005075:Biological Evolution; D001808:Blood Vessels / Q000166:cytology*; D002196:Capillaries / Q000166:cytology; D002816:Chordata, Nonvertebrate / Q000033:anatomy & histology*; D004847:Epithelial Cells; D008074:Lipoproteins / Q000032:analysis; D008208:Lymphatic System / Q000166:cytology*; D008854:Microscopy, Electron; D009210:Myofibrils; D014680:Veins / Q000166:cytology
chemical_list: D008074:Lipoproteins