A German SME offers a hydrogel system for 3-D cell culture based on synthetic or natural polymers as cells cultured in 3-D in vitro resemble the physiology of their counterparts in vivo much better than cells cultured on flat surfaces. The hydrogels can be easily modified with bioactive components to adapt the extracellular environments to specific needs of the cell culture. Robust gel formation is amenable to automation, injection and in situ gelation. The SME looks for technical co-operations.