Paste one protein sequence as one-letter codes, or one FASTA record. At most 5,000 residues. Spacing and line breaks are ignored, and a FASTA header is read but not kept.
No sequence yet.
One variant per line, written as the residue you expect, its position, and the residue to put there — T315I. Join substitutions with + to combine them in a single variant (T315I+E255K). At most 50 variants. Each expected residue is checked against the sequence, so a numbering mismatch is caught before the job runs.
The number of the first residue in the sequence above. Set it so positions match the numbering your variants use.