Fig. 2From: Assembly of hydrogel units for 3D microenvironment in a poly(dimethylsiloxane) channelVarious size of the hydrogel villi structure on the PDMS mold. We verified that hydrogel villi were successfully fabricated irrespective of their long dimension and aspect ratio, which was limited by conventional methods. The height of the villi structure was a 300 b 450, c 650, and d 1000 μm. Scale bars 500 µmBack to article page