Fig. 3. Organ asymmetry evolved to store a regionalized and long gut tube. (A) The regionalized (as represented by the color gradient) gastrointestinal (GI) tract of a snail. Note that its length exceeds that of the main body axis. A compartmentalized GI tract that exceeds body length will inevitably be packaged asymmetrically. (B) We hypothesize that the urbilaterian GI tract was also regionalized and asymmetrically arranged. D, dorsal; V, ventral; other axes as Fig. 2.
Image published in: Blum M et al. (2014)
Copyright © 2014. Image reproduced with permission of the Publisher.
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