return the sequence for this fastq formatted sequence . the sequence will not be null . concode_field_sep String sequence concode_elem_sep FastqVariant variant concode_elem_sep String description concode_elem_sep String quality concode_field_sep String getQuality concode_elem_sep FastqVariant getVariant concode_elem_sep FastqBuilder builder concode_elem_sep String getDescription
String function ( ) { return sequence ; }