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Shape-preserving carbonization of 4T1 CSCs. (A) Pyrolysis of CSCs produces an opaque powder comprised of particles that have retained cellular structure (C). Etching of the silica produces a carbon rich replica. (D) In situ electrical characterization of carbonized particles shows a 20-fold decrease in electrical resistance across a particle following silica etching. (Scale bars, B and C: 2 μm; Insets, 500 nm).
