Microchannels fabrication process.

<p>Scheme of the device (<b>a</b>); Microphotograph of the device. One Euro coin added as a scale (<b>b</b>); Phase contrast pictures of cross section of channels fabricated in PDMS and agarose (<b>c</b>); Steps of fabrication (<b>d</b>) and (<b>e</b>). More detailed information provided in Figure S1. Scale bar 50 µm.</p>