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- 09:00, 11 Ocak 2011 S8600021 talk contribs uploaded File:Foster036.jpg (FIG. 36. DIAGRAM OF THE CIRCULATION OF THE YOLK-SACK AT THE END OF THE THIRD DAY OF INCUBATION. H. heart. A A. the second, third and fourth aortic arches ; the first has become obliterated in its median portion, but is continued at its proximal end as t)