It is possible to filter for amino acid and nucleotide bases/mutations. Multiple mutations can be provided by specifying a comma-separated list.
A nucleotide mutation has the format <position><base>. A “base” can be one of the four nucleotides A, T, C, and G. It can also be - for deletion and N for unknown.
An amino acid mutation has the format <gene>:<position><base>. The following genes are available: E, M, N, ORF1a, ORF1b, ORF3a, ORF6, ORF7a, ORF7b, ORF8, ORF9b, S. A “base” can be one of the 20 amino acid codes. It can also be - for deletion and X for unknown.
The <base> can be omitted to filter for any mutation. You can write a . for the <base> to filter for sequences for which it is confirmed that no mutation occurred, i.e., has the same base as the reference genome at the specified position.