Click on a link to retrieve supplementary data submitted for this article:

• Video 1: A series of 20 minute images of epithelial kidney cells taken over 24 hours
• (Windows Media format, KB)
• Video 2: Images of the calcium waves in a small cluster of 8 cardiac myocytes before insertion of alpha toxin into one cell in the cluster. Note the calcium waves are synchronised
• (Windows Media format, KB)
• Video 3: Images of the calcium waves in a small cluster of 8 cardiac myocytes after insertion of the alpha toxin channels into the centre cell in the cluster. Note the calcium waves are now not synchronised
• (Windows Media format, KB)

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