Polymeric Aqueous Biphasic Systems for Non‐Contact Cell Printing on Cells: Engineering Heterocellular Embryonic Stem Cell Niches

An optimized polymeric aqueous two-phase system allows direct and non-contact printing of cells onto a monolayer of living cells in arbitrary shapes as well as in a high-density microarray format to create heterocellular microenvironments and study the effect of direct cell–cell interactions on cell fate. The entire process is performed in aqueous media to support full cell viability and functionality. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.