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About the Cover
The demosponge Tethya wilhelma displays strong endogenic rhythmic body contractions, which can be precisely quantified by combining digital time lapse photography and automated image analysis (see article by M. Nickel, p. 4515-4524). A day:night rhythm was found as well as the sponge's ability to directly contract upon external mechanical stimuli, which makes T. wilhelma an ideal model for signal integration in aneural metazoa.
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