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# Performs repeat masking of sequences and outputs the results in FASTA format. The repeats are masked with the letter 'N'
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DNA = new DNA sequence dataset(DataTrack:DNA)
RepeatMasker = new Region dataset(DataTrack:RepeatMasker)
DNA_masked = mask DNA with 'N' where inside RepeatMasker
masked_sequences = output DNA_masked in FASTA format {Strand orientation=From Gene,Header=Sequence name,Column width=60}