Additional file 1.

The pre-existence of straw cells from a tissue. Description: A procedure to observe the tubular structure: (1) collect 1 μl of extracellular fluid from the surface of any frozen bovine liver tissues from a grocery store, (2) place directly on a glass slide and observe the straw cells under a light microscope. As the droplet dries, the existence of tubular structures and their connected networks are revealed. The time-lapse images can be viewed using the Microsoft PowerPoint Presentation slideshow function with a click of mouse for each time point.

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Wu et al. BMC Cell Biology 2007 8:36   doi:10.1186/1471-2121-8-36