@article {377511, title = {Programming Mechanical and Physicochemical Properties of 3D Hydrogel Cellular Microcultures via Direct Ink Writing}, journal = {Advanced Healthcare Materials}, volume = {5}, year = {2016}, pages = {1025{\textendash}1039}, author = {J. M. McCracken and A. Badea and M. E. Kandel and A. S. Gladman and D. J. Wetzel and G. Popescu and J. A. Lewis and R. G. Nuzzo} }