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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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statsComputed sequence statistics
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formatReadonly
qualityQuality scores as ASCII string - required for FASTQ
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qualityQuality encoding system detected or specified - required for FASTQ
Optional
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qualityParsed numeric quality scores (lazy-loaded)
Optional
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qualityComputed quality statistics
FASTQ sequence with quality scores and statistics Format:
Id
description\nsequence\n+\nquality