Table 1. Internal standards that were spiked into E. faecalis lipid extracts.

Internal standard	Catalogue #	Stock conc. [mg/ml]	Final conc. [μg/ml]	Precursor ion (m1) m/z	Fragment ion (m3) m/z
PG 14:0	840445P	1	5	665.5 [M-H]-	153
Lysyl PG 16:0	840520P	0.1	4	849.6 [M-H]-	145
CL 14:0	750332P	1	100	1239.9 [M-H]-, 619.5 [M-2H]2-	153, 227