If your European patent application discloses nucleotide or amino acid sequences (unbranched sequences of four or more amino acids or unbranched sequences of ten or more nucleotides), the description must contain a sequence listing complying with WIPO Standard ST.25 and presented as a separate part of the description. The sequence listing must be filed in electronic form, i.e. in text format (.txt). You are advised to use the EPO's free BiSSAP or PatentIn software, which simplifies standardised sequence presentation. If you also file on paper or in PDF format, you must submit a statement that the sequence listings in electronic form and on paper or in PDF format are identical.