Porous bulk hydrogel made from annealed microgels support fibroblast proliferation. HA microgels labeled green with Alexa-Fluor 488, and human dermal fibroblast actin and nuclei stained with rhodamine-B conjugate of phalloidin (red) and DAPI (blue) respectively. Adapted with permission from E. Sideris, D.R. Griffin, Y. Ding, S. Li, W.M. Weaver, D. Di Carlo, T. Hsiai, T. Segura, ACS Biomater. Sci. Eng. 2 (2016) 2034–2041 [627]. Copyright 2016 American Chemical Society.