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| A | allantois (143), amnion attachment (125), aortic arch 1 (38), aortic arch 2 (16), aortic arch 3 (21), artifact separation(s) (192), artifact space(s) (94) |
| C | cardiac jelly (33), caudal edge of allantoic diverticulum (1), caudal edge of gastrulation (primitive) groove (1), caudal edge of head fold (1), caudal edge of hindgut primordium (lumen) (2), caudal edge of intra-embryonic coelom (1), caudal edge of primordial otic placode (1), caudal edge of somite 1 (O-1) (2), caudal edge of somite 2 (O-2) (2), caudal edge of somite 3 (3), caudal edge of somite 4 (O-4) (2), caudal intestinal portal (6), caudal part of mesencephalon primordium (M) (1), caudal part of neural plate (2), caudal part of notochordal plate (2), caudal part of primordial pericardial cavity (1), caudal part of prosencephalon primordium (P) (1), caudal part of rhombencephalon primordium (R) (1), caudal part of ventral ectodermal ridge (1), cephalic edge of allantoic diverticulum (1), cephalic edge of foregut primordium (lumen) (1), cephalic edge of heart primordium (1), cephalic edge of left neural fold (1), cephalic edge of primordial otic placode (1), cephalic edge of primordial pericardial cavity (1), cephalic edge of right neural fold prosencephalon primordium (P) (1), cephalic edge of somite 1 (O-1) (3), cephalic edge of somite 2 (O-2) (2), cephalic edge of somite 3 (O-3) (3), cephalic edge of somite 4 (O-4) (2), cephalic intestinal portal (6), cephalic part of gastrulation (primitive) groove (1), cephalic part of gastrulation (primitive) streak (1), cephalic part of umbilical vesicle cavity (1), common umbilical artery (15), common umbilical vein (34), conotruncus (11) |
| E | ectoderm (17) |
| F | floor plate (103), foregut endoderm (6), foregut primordium (lumen) (11) |
| H | head fold region (9), hepatic plate endoderm (1), hindgut primordium (lumen) (28) |
| I | intermediate mesenchyme (52), interventricular sulcus (45), intra-embryonic coelom (9), isthmus of rhombencephalon (43) |
| J | junction of allantoic diverticulum and hindgut (1), junction of amnion and umbilical vesicle (3), junction of brain and spinal cord (11), junction of caudal edge of embryo and connecting stalk (1), junction of left and right umbilical veins (1), junction of left umbilical artery and primordial left dorsal aorta (1), junction of mesencephalon and rhombencephalon (3), junction of mesencephalon primordium (M) and prosencephalon primordium (P) (1), junction of neural ectoderm and surface ectoderm (14), junction of neural folds (1), junction of umbilical arteries (3) |
| L | left neural fold (3), left umbilical artery (248), left umbilical vein (134), left umbilical vein (terminal part) (1), left vitelline (omphalomesenteric) artery (10), left vitelline (omphalomesenteric) vein (25) |
| M | mesencephalon primordium (M) (12), mesenchyme (15), midgut primordium (lumen) (34) |
| N | neural cord (7), neural ectoderm prosencephalon primordium (P) (1), neural fold of prosencephalon primordium (P) (4), neural vesicle (1) |
| O | oropharyngeal membrane (6) |
| P | pharyngeal arch 1 (18), pharyngeal pouch 1 (46), pharyngeal pouch 2 (28), presumptive left atrium (11), presumptive left ventricle (25), presumptive right atrium (16), presumptive right ventricle (6), primordial endocardium (1), primordial endocardium in midline (3), primordial epimyocardium (6), primordial left dorsal aorta (44), primordial myocardium (1), primordial neural crest (artifact separation) (5), primordial otic placode (10), primordial pericardial cavity (20), primordial right dorsal aorta (25), prosencephalon primordium (P) (8) |
| R | region of mesencephalic (cephalic) flexure (30), rhombencephalon primordium (R) (15), rhombomere A (Rh. A) (9), rhombomere B (Rh. B) (14), rhombomere C (Rh. C) (15), rhombomere D (Rh. D) (14), right neural fold (4), right umbilical artery (217), right umbilical vein (125), right umbilical vein (terminal part) (1), right vitelline (omphalomesenteric) artery (6), right vitelline (omphalomesenteric) vein (17) |
| S | separation artifact (10), septum transversum (69), somatopleure (14), somatopleuric mesoderm (18), somite 1 (O-1) (12), somite 2 (O-2) (10), somite 3 (O-3) (11), somite 4 (O-4) (8), somitocoel 1 (5), somitocoel 2 (8), somitocoel 3 (4), spinal cord part of neural plate (2), spinal cord primordium (6), spinal cord primordium (caudal part) (2), splanchnopleure (8), splanchnopleuric mesoderm (21), splanchnopleuric mesoderm (epimyocardium) (1), surface ectoderm (351) |
| T | terminal notch (5) |
| U | umbilical vesicle angioblastic tissue (1) |
| V | ventral ectodermal ridge (11) |
