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(A) Schematic of the ECM and hydrogel analogy with lumped parameters. (B) GM model. (C) GV model. The subscript n refers to the model order, for example, n = 1 is the first order. Alternative nomenclature for these and other models is provided in the Supplementary Information SI2. ECM, extracellular matrix; GM, generalized Maxwell; GV, generalized Voigt. Color images are available online.
