The Label as Circular and Label as Linear tools, located in the Functions section of the Toolkit panel, mark the sequences in a set as being linear or circular. This ability may be useful for sequences originating in formats where type is unspecified, such as FASTA files.
If you use either of these functions, the information will be added to the output file, where allowed (e.g., .gbk). The presence of sequence type information may affect the results of searching in an endpoint expression. For example, a match can cross the origin in a circular sequence, but not in a linear one.
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