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- ADMINISTRATIVE INSTRUCTIONS UNDER THE PCT
Amino Acid Sequences
Symbols to Be Used
16. The amino acids in a protein or peptide sequence shall be listed in the amino to carboxy direction from left to right. The amino and carboxy groups shall not be represented in the sequence.
17. The amino acids shall be represented using the three-letter code with the first letter as a capital and shall conform to the list given in Appendix 2, Table 3. An amino acid sequence that contains a blank or internal terminator symbols (for example, "Ter" or "*" or ".") may not be represented as a single amino acid sequence, but shall be presented as separate amino acid sequences (see paragraph 22).
18. Modified and unusual amino acids shall be represented as the corresponding unmodified amino acids or as "Xaa" in the sequence itself if the modified amino acid is one of those listed in Appendix 2, Table 4, and the modification shall be further described in the feature section of the sequence listing, using the codes given in Appendix 2, Table 4. These codes may be used in the description or the feature section of the sequence listing but not in the sequence itself (see also paragraph 32). The symbol "Xaa" is the equivalent of only one unknown or modified amino acid.
Format to Be Used
19. A protein or peptide sequence shall be listed with a maximum of 16 amino acids per line, with a space provided between each amino acid.
20. Amino acids corresponding to the codons in the coding parts of a nucleotide sequence shall be placed immediately under the corresponding codons. Where a codon is split by an intron, the amino acid symbol should be given below the portion of the codon containing two nucleotides.
21. The enumeration of amino acids shall start at the first amino acid of the sequence, with number 1. Optionally, the amino acids preceding the mature protein, for example pre-sequences, pro-sequences, pre-pro-sequences and signal sequences, when present, may have negative numbers, counting backwards starting with the amino acid next to number 1. Zero (0) is not used when the numbering of amino acids uses negative numbers to distinguish the mature protein. It shall be marked under the sequence every five amino acids. The enumeration method for amino acid sequences set forth above remains applicable for amino acid sequences that are circular in configuration, with the exception that the designation of the first amino acid of the sequence may be made at the option of the applicant.
22. An amino acid sequence that is made up of one or more non-contiguous segments of a larger sequence or of segments from different sequences shall be numbered as a separate sequence, with a separate sequence identifier. A sequence with a gap or gaps shall be numbered as a plurality of separate sequences with separate sequence identifiers, with the number of separate sequences being equal in number to the number of continuous strings of sequence data.
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