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Energy-dispersive X-ray (EDS) spectra of mouse and human islets show emergence of significant silicon peak at islet surface 4 h after exposure to silicification medium. Unexposed mouse (A) and human (C) control islets show no detectible level of silicon. Mouse (B) and human (D) islets showed a silicon peak after culture that in general ranged from 1 to 8% by weight relative to other detectible elements (typically C, O, N, S, P).
