mass spectrometry assay matrix assisted laser desorption ionization imaging mass spectrometry assay A mass spectrometry assay that involves collection of spatially resolved mass spectra of a sample during microscopy where a pulse laser is used to produce both ionisation and vaporization. The sample is held in a matrix (such as dihydrobenzoic acid) to protect it from direct laser illumination and to separate the sample molecules. The spectra are used to visualise the spatial distribution of biomolecules by their molecular masses. https://github.com/obi-ontology/obi/issues/1406 url:http://purl.obolibrary.org/obo/CHMO_0000054 MALDI-IMS Michelle Giglio matrix assisted laser desorption ionization imaging mass spectrometry assay CFDE Suvarna Nadendla Rebecca Jackson metadata complete