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If a database identifier is associated with an incorrect InChI in a database it will not be mapped to the correct metabolite in a reconstruction.
The use of N/A and a database identifier represents the presence or absence of a compound in a given database.
External database entries are generally required to include at least a database identifier and a standard InChI to be included in the UniChem database.
The best way to represent a chemical compound is not by a name or even a database identifier, but by its structure encoded in Structure Data Format (SDF MDL V2000) or the open Chemical Markup Language (CML) format or InChI codes.
Similar(55)
For example, annotations made with the ISA GO evidence code ('inferred from sequence alignment') require the inclusion of a stable database identifier that identifies the similar gene/gene product.
However, for new (emerging) anthropogenic substances and transformation products of known chemicals, these strategies would not work so well as they would have neither a high reference count nor a low database identifier.
Users can submit a word, database identifier or phrase and retrieve a list of corresponding database records.
All word types have a WHG database identifier, while protein and chemical word types are also associated with a semantic identifier, which allows them to be connected to the content of external databases.
The Editor traverses each participant in the pathway, and determines whether a Pathway database identifier for the participant compound is present in the list of compounds in each experiment.
An STR only appears in STaRRRT if the gene has a RefSeq database identifier; An STR only appears in STaRRRT if the gene has an HGNC Gene Symbol; txPos was limited to −2000 to +1000 bp in the creation of STaRRRT; sr = simple repeats, as appears in the UCSC Genome Browser; Period was limited to 1 to 9 bp; perMatch was limited to ≥ 90%.
Information captured in the data model may be relatively simple, such as an external database identifier, or it may be more complex, such as the details of an RNAi experiment.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com