Applied Biosystems Data Explorer 4 Series User Manual page 404

Appendix C
Displaying the
C
original labels
C-8 Applied Biosystems
Data Explorer Toolbox (Visual Basic Macros)
If DNA or RNA is selected, the software:
To display the original labels, select Peak Label from the
Peaks menu in the Data Explorer software, then deselect
User Labels box.
• Examines the spectrum in 270 Da increments
and selects the most intense ion in the range.
(The 270 Da increment is used because it is
less than the smallest mass difference related
to a DNA or RNA base.)
• Labels mass differences (plus or minus the
specified Tolerance) that correspond to DNA
(ACGT) or RNA (ACGU) bases.
• Labels the reference peak from which the
mass difference was derived with an
asterisk (*).
• Applies the additional labels you selected
under Annotate Spectrum.