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Pig fetus cross-section: morphology and single ion images. (A) Optical image of H&E-stained pig fetus cross-section showing its morphology, including the brain (left), heart (center), and liver (dark region below heart). (B and C) Characteristic ion images for the pig fetus dataset at (B) 888.67 m/z, showing the brain and liver, and (C) 186.42 m/z, showing the heart.
