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idSequence identifier (required, but may be empty string in malformed data)
Optional
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descriptionOptional description/comment line
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sequenceThe actual sequence data
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lengthCached sequence length for performance
Optional
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lineOriginal line number where this sequence started (for error reporting)
Optional
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qualityQuality scores as ASCII string (present if FASTQ)
Optional
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qualityQuality encoding system (present if FASTQ)
Optional
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statsComputed sequence statistics
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formatOptional
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gcGC content ratio (0.0 to 1.0)
FASTA sequence representation with computed statistics Format: >id description\nsequence