Luo Z, Zhang S, Pan J, Shi R, Liu H, Lyu Y, Han X, Li Y, Yang Y, Xu Z, Sui Y, Luo E, Zhang Y, Wei S. Time-responsive osteogenic niche of stem cells: A sequentially triggered, dual-peptide loaded, alginate hybrid system for promoting cell activity and osteo-differentiation. Biomaterials. 2018 05; 163:25-42.