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Injection of mNP and saline into a sausage. Approximately 0.2 ml of saline or 12.5 mg Fe/ml mNP was injected into the sausage at each of the positions in intervals of 40 s. Injections at the times indicated on the figure. The injection positions were approximately 1 cm from the sensor and spaced by 1 cm along the sausage.
