Peptide gels of fully-defined composition and mechanics for probing cell-cell and cell-matrix interactions in vitro od Ashworth, JC, Thompson, JL, James, JR, Slater, CE, Pijuan-Galito, S, Lis-Slimak, K, Holley, RJ, Meade, KA, Thompson, A, Arkill, KP, Tassieri, M, Wright, AJ, Farnie, G, Merry, CLR