refine, potential modification mass

# refine, potential modification mass ## Syntax The value of this parameter is an ASCII string, of the format M1@X1,M2@X2,..., Mn@Xn where Mi is a floating point number (potential modification mass in Daltons) and Xi is a single letter abbreviation for a type of amino acid residue. ## Notes No error is produced if a non-standard amino acid abbreviation is used. If a residue type is listed more than once, the last instance of the residue is used to set the modification. Both positive and negative potential modification masses may be used. ## Description The format of this parameter is the same as the residue, potential modification mass parameter. See this discussion of this parameter for a general explanation of its meaning and use. The value for the refine version of this parameter is used to create a longer, more comprehensive list of relatively rare potential modifications. The value of the use potential modifications for full refinement parameter controls which steps in the refinement use this parameter. see also: residue, potential modification mass | refine | refine, use potential modifications for full refinement X! TANDEM API description project