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MS and optical images of spheroid slices. (A) A common ion [PC(34:1) + H]+ (m/z 760.5964) illustrating shapes of MS images of spheroid slices in the control and drug treatment groups. (B) Optical images of the corresponding spheroid slices. (C) MS images of [Irinotecan + H]+(m/z 587.2923) in drug treated spheroids.
