Table 2. Quantitative values for ELISA kits and MALDI-MSI. Reproducibility of quantification was checked. Two samples (two mice) were assayed; the accuracy of the quantitative values by MALDI-MSI was assessed using the quantitative values by ELISA as true values.

Sample	DA concentration (µg/g)		Accuracy (%)
	ELISA	MALDI–MSI
1	7.8	6.5	10.7
2	11.1	13.0	10.6

DA, dopamine hydrochloride; ELISA, enzyme-linked immunosorbent assay; MALDI, matrix-assisted laser desorption/ionization, MSI; mass spectrometry imaging.