Table 1.

TIA detected by Single-cell MS analysis (mass range m/z = 100–1,000)

Molecular formula	[M+H]+	Measured m/z	Delta, ppm	Stem tissue	IC	LC	PC	EC	Speculated compound
C21H24N2O2	337.191054	337.19097	−0.25	○	○	○	○	○	Catharanthine
C21H20N2O3	349.154668	349.15456	−0.31	○	○	○			Serpentine
C21H22N2O3	351.170318	351.16950	−2.33	○	○	○			Cathenamine
C21H24N2O3	353.185968	353.18578	−0.53	○	○	○			Ajmalicine
C21H26N2O3	355.201618	355.20129	−0.92	○	○	○			Stemmadenine
C22H26N2O3	367.201618	367.20096	−1.79	○	○	○			16-Methoxytabersonine
C21H24N2O4	369.180883	369.18066	−0.60	○	○	○			Horhammericine
C22H28N2O4	385.212183	385.21165	−1.38	○					16-Methoxy-2,3-dihydro-3-hydroxytabersonine
C24H30N2O5	427.222748	427.22248	−0.63	○	○	○			Demetoxyvindoline
C25H32N2O6	457.233312	457.23253	−1.71	○					Vindoline
C27H34N2O9	531.233706	531.23268	−1.93		○				Strictosidine

○ denotes that chemical compound exists in stem tissue each cell type (n = 3).