You can download the above example and submit it to UniqueProt.
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Each protein sequence starts with a line beginning with ">".
Everything after that line is aminoacids in their one-letter code.
uniqueProt ignores the proteins, being found twice or more times in
this list.
It does not matter wether the aminoacids are typed in lower or upper
case, if there are whitespaces between them nor how much there are in one
row.
You may mark the entries with a newline character (but you don't have
to!), like it is done between MAT3_RAT and AKA8_HUMAN.