Dimethyl Label Light-Medium-Heavy Mass Shift Lookup
Retrieve scheme-qualified dimethyl-label monoisotopic shifts per labeled amine, not per protein. Bounded exact-key educational reference only; observations and applicability must be established independently.
Description
Retrieve scheme-qualified dimethyl-label monoisotopic shifts per labeled amine, not per protein.
Isotope-label mass shifts depend on the labeling reagents and the site being counted. This reference returns the tool's stored shifts per labeled amine for its named schemes.
When to use this tool
Retrieve scheme-qualified dimethyl-label monoisotopic shifts per labeled amine, not per protein.
- Prepare the supplied key fields for this operation.
- Compare the complete example with the representation used by your own input before carrying the result into another step.
How to use the tool and how it works
- Enter key. Use the exact text syntax, units and index conventions explained below.
- Run the tool. If input validation fails, correct the supplied fields before interpreting any result.
- Read result.reference. Interpret false, null and empty lists using the distinctions below; they can be valid outputs.
Supply key exactly as one of "light", "medium", "heavy". Check for that own key in the fixed local table and return its stored reference text unchanged. An unsupported key is an input error, rather than a null result; there is no network request, fuzzy matching or dynamic text generation.1
| Input field | Meaning and representation | Accepted input |
|---|---|---|
| key | Exact stored-entry key; spelling and case must match. | "light", "medium", "heavy" |
| Output field | Interpretation |
|---|---|
| result | Object containing the named outputs below. |
| result.reference | The unchanged stored text for the supported exact key; unsupported keys cause an input error. |
{
"input": {
"key": "light"
},
"output": {
"result": {
"reference": "Dimethyl mass shift +28.031300 Da per labeled amine for CH2O/NaBH3CN."
}
}
}Limitations and assumptions
- The lookup does not count peptide labeling sites, inspect isotope purity or calculate a complete labeled precursor mass. Reagent schemes need to match the selected entry.
- Every declared top-level field is required and unexpected fields are rejected. Numeric inputs must be finite; ordinary text fields are bounded to 8,192 UTF-16 code units, with tighter operation-specific limits where stated.
- Ordinary string lists have at most 128 entries of at most 128 code units each; numeric lists and matrices have separate bounded size checks. Nonfinite results and excessively large serialized outputs are rejected.
- Indexes are zero-based and spans have an exclusive end unless explicitly stated otherwise. A valid false, null or empty-list result is distinct from malformed input.
Alternative or Complementary methods
Use compatible mass, charge and sequence conventions when combining these operations. Inspect experimental spectra or quantitative controls separately; sequence features and theoretical mass arithmetic are not peptide identification or biological interpretation.
References
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