>seq001 basic DNA sequence
ATCGATCGATCGATCGATCG
>seq002 GC-rich sequence
GCGCGCGCGCGCGCGCGCGC
>seq003 AT-rich sequence
ATATATATATATATATATAT
>seq004 palindromic sequence
AATTCCGGAATTCCGGAATT
>seq005 mixed sequence
ATCGGCTATGCATGCTAGCT