FASTA Format Help

The input sequences must follow these rules:

1. The input may or may not have a line starting with '>'.
2. If the input sequence does not have a line starting with '>', a line will be added at the top '>user_input_sequence', and the entire input will be considered a single FASTA sequence of amino acids.
3. For multiple sequences, each sequence must start with a line beginning with '>' containing a valid description. The allowed characters for the header are "A" to "Z", "a" to "z", "0" to "9", "_", "-", ".", ",", ;", "=", and "|" with SPACES between them. Each header must be unique.
4. The allowed characters for amino acids sequences are: abcdefghiklmnpqrstuvwxyz * -
5. The sequence is not case sensitive.