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MALDI-MS images of cancer drugs. MALDI-MS images of the same scaffold containing (A) 500 μM doxorubicin and (B) 500 μM irinotecan in Matrigel-only (top corners) and cell-laden (bottom corners) zones. The images are arranged as columns (from left-to-right) for the [M + H]+, [M + Na]+, and [M+K]+ species, along with their respective mass error.
