Comparison of MALDI-MSI of Medicago truncatula root nodules using the previously reported airbrush method, automatic
sprayer Method 4, and sublimation Method 4. (a) Optical images comparing
matrix coverage and crystal size for the airbrush (left), optimized
automatic sprayer (middle), and optimized sublimation (right) matrix
application methods using DHB for the matrix. (b) Optical images comparing
matrix coverage and crystal size for the airbrush (left), optimized
automatic sprayer (middle), and optimized sublimation (right) matrix
application methods using CHCA for the matrix.