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- ADMINISTRATIVE INSTRUCTIONS UNDER THE PCT
Nucleotide Sequences
Symbols to Be Used
8. A nucleotide sequence shall be presented only by a single strand, in the 5"-end to 3"-end direction from left to right. The terms 3" and 5" shall not be represented in the sequence.
9. The bases of a nucleotide sequence shall be represented using the one-letter code for nucleotide sequence characters. Only lower case letters in conformity with the list given in Appendix 2, Table 1, shall be used.
10. Modified bases shall be represented as the corresponding unmodified bases or as "n" in the sequence itself if the modified base is one of those listed in Appendix 2, Table 2, and the modification shall be further described in the feature section of the sequence listing, using the codes given in Appendix 2, Table 2. 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 "n" is the equivalent of only one unknown or modified nucleotide.
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