+The following symbols determine the output format:
+ * `:genbank` for Genbank
+ * `:embl` for EMBL
+ * `:fasta` for FASTA
+ * `:fasta_ncbi` for NCBI-type FASTA
+ * `:raw` for raw sequence
+ * `:fastq` for FASTQ (includes quality scores)
+ * `:fastq_sanger` for Sanger-type FASTQ
+ * `:fastq_solexa` for Solexa-type FASTQ
+ * `:fastq_illumina` for Illumina-type FASTQ