HyStem-C contains thiolated hyaluronic acid & gelatin for easy 3D cell culture. HyStem-C version 2.0 is reconstituted with a buffered 1X PBS. The resulting components will also result in a pH neutral isotonic salt hydrogel. The ending pH, osmo, and rheological properties are the same from Version 1.0 to Version 2.0. HyStem-C hydrogels provide an excellent starting point for optimizing the matrix for cell culture. HyStem-C is fully chemically-defined and based on three biocompatible components: thiol-modified hyaluronan (Glycosil), thiol-reactive crosslinker, PEGDA (Extralink), and thiol-modified denatured collagen (Gelin-S). Gelin-S provides basic cell-attachment sites for a wide variety of primary cells and cell lines and is therefore recommended as an ideal substrate for adherent cell types and for cell culture optimization. In some cases, HyStem-C hydrogels can be further enhanced by the addition of ECM proteins to match native signals.