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The effect of MgCl2 concentration on the SERS intensity of one of the major Raman bands (peak #2: 1393 cm−1) from the ERBB2-MS nanoprobes (a) and (peak #2*: 1354 cm−1) from the KI-67-MS nanoprobes (b). (●): 5 mM, (▵): 4 mM, (+): 3 mM, (−): 0 mM.
