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Figure 4


Fig. 4. Radiographs showing the regurgitation of food from the stomach of a Cancer gracilis in 60%SW. The boundaries of the foregut and oesophagus are shown. (A,B) The cycle starts with a relaxation of the foregut (C,D), followed by a strong contraction of the cardiac sac (solid arrows). (E,F) Increasing waves of contraction expel food up and out of the oesophagus (dotted arrows).





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