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This page is meant to be a tool for mass spectrometry. The monoisotopic masses
for nearly 11 000 biologically relevant organic molecules have been calculated and
inserted into a database to be searched against.
Natural composition (12C 14N)
13C and 15N labeled
+1 (additional H+)
-1 (one less H+)
+1 (one less e-)
-1 (additional e-)
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