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A stylized diagram of a spherical tumor with a central core, showing nutrient exchange and chemoattractants with arrows.

A stylized diagram of a spherical tumor with a central core, showing nutrient exchange and chemoattractants with arrows.
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A spherically symmetric tumor with radius s(t) which changes in time and a necrotic core (consisting of dead cells and wastes) of fixed radius. The tumor consist of live cells. Depict the exchange of nutrients which happens in the tumor through diffusion and drift processes (pay attention that I want diffusion and drift drawn, even through only moving arrows). Also include the presence of chemoattractants. See more

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