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A cross-section of an idealized solid tumor, as adapted from Ref. [11]. The inner gray region is composed of necrotic tissue. The cross-hatched layer is composed of living, quiescent cells (non-proliferative). It has a thickness δn. The outer shell, with thickness δp, is composed of proliferative cells. Both length scales δn and δp are determined by nutritional needs of the cells via diffusional transport.
