A FASTA-type anvi’o artifact. This artifact is typically provided by the user for anvi’o to import into its databases, process, and/or use.
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A FASTA-formatted file that does not necessarily meet the standards of a contigs-fasta.
But what is a FASTA file?
A FASTA file contains sequences (in this case, nucleotide sequences, though they can also describe peptide sequences) that are formatted as follows:
>SEQUENCE_ID VARIOUS_SEQUENCE_DATA SEQUENCE
VARIOUS_SEQUENCE_DATA region can contain data such as the NCBI taxon ID, GI accession number, a text description of the sequence, or the start and end positions if the sequence is a portion of a larger sample. All of this information is optional.
The sequence itself is written in standard IUPAC format (though it can be written in lower-case letters).
For a concrete example, you can download sequences from the NCBI database in FASTA format.
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