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This table lists a series of PTMs and PTM combinations that are of strictly same mass.
| Mass | PTM | Isobaric PTM Combination 1 | Isobaric PTM Combination 2 | Isobaric PTM Combination 3 |
|---|---|---|---|---|
| 42.0106 | acetyl | formyl + methyl | -- | -- |
| 56.0262 | propionyl | acetyl + methyl | formyl + dimethyl | -- |
| 70.0419 | butyryl | propionyl + methyl | formyl + trimethyl | acetyl + dimethyl |
| 100.0160 | succinyl | malonyl + methyl | ||
| 114.0317 | glutaryl | hydroxybutyryl + formyl | malonyl + dimethyl | succinyl + methyl |
