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Fabrication of microfluidic hydrogels for perfusion cell culture. (A) Schematic of the fabrication of microfluidic cell-laden hydrogels using a helical spring as a template. Reprinted with permission from ref 629. Copyright 2012 Wiley Periodicals, Inc. (B) Schematic of the fabrication of microfluidic cell-laden hydrogels based on sacrificial printed carbohydrate-glass fibers. Reprinted with permission from ref 592. Copyright 2012 Nature Publishing Group.
