Figure 12.

Distribution of Selected PA Molecular Species.

(A) to (D) Distribution of selected PA molecular species in mol %. Ion counts within ± 0.02 m/z units of each potassiated [M + K]⁺ (labeled on figure) and sodiated [M + Na]⁺ monoisotopic masses are normalized to the total PA ion signals on each pixel. A red-green linear color scale is used with a maximum mol % value corresponding to 60% of total PA for all images. See Supplemental Table 4 online for all PA species identified and m/z analysis for each species. Bar = 1 mm.

(E) Comparison of PA molecular species from MALDI-MSI sections.