MSI	Mass spectrometry imaging
GC-MS	Gas chromatography–mass spectrometry
LC-MS	Liquid chromatography–mass spectrometry
UHPLC-Orbitrap-MS	Ultra-performance liquid chromatography–orbitrap–mass spectrometry
NanoSIMS	Nanoscale secondary ion mass spectrometry
MALDI-2	Matrix-assisted laser desorption/ionization with laser-induced post-ionization
IMS	Ion mobility spectrometry
MALDI-MSI	Matrix-assisted laser desorption/ionization–mass spectrometry imaging
DESI-MSI	Desorption electrospray ionization–mass spectrometry imaging
SIMS	Secondary ion mass spectrometry
MALDI-FT ICR MSI	Matrix-assisted laser desorption/ionization (MALDI)–Fourier transform ion cyclotron resonance (FT ICR) mass spectrometric imaging
ELDI/MS	Electrospray-assisted laser desorption/ionization mass spectrometry
TOF-SIMS	Time-of-flight secondary ion mass spectrometry
LC-HR-ESIMS	Liquid chromatography–high-resolution–electrospray ionization mass spectrometry
RF	Random forest
PLS-DA	Partial least squares–discriminant analysis
LASSO	Least absolute shrinkage and selection operator
RFE	Recursive feature elimination
CsCl	Cesium chloride
DESI-MS/MS	Desorption electrospray ionization–tandem mass spectrometry
UA	Ustalic acid
PESI-MS/MS	Probe electrospray ionization tandem mass spectrometry
TMBA	2,4,5-trimethoxybenzaldehyde
T2T	Telomere-to-telomere
GLP	Ganoderma lucidum polysaccharides
OCT	Optimal cutting temperature compound
fs-LDPI-MSM	Femtosecond laser desorption post-ionization–mass spectrometry microscopy
CCS	Collision cross-section
DESI-cIM-MS	Desorption electrospray ionization–cyclic ion mobility–mass spectrometry
nano-DESI-TIMS-MSI	Nanospray desorption electrospray ionization MSI coupled with high-resolution trapped ion mobility spectrometry
SEM	Scanning electron microscope
AI	Artificial intelligence