ex2: unknown sequnece

>ex2     

ggtttacaattgtaccccaaggtcatgggactggaccccatcccatagtaagtcatcagt
ttagcaatgataaagaaaataaccttctgaaaatttgtatagatcagaaataaagtattt
tttgtggaagactatttttaagtattgaaggtactatttcctttcttgaattcatattgc
agatgtacggtgtggatttattggtttatctctgcaaaccttaaagtagaagattgcaag
ggccaggtgtggtggatcacgcctgtaatcccagcactttgggaggctgaggtaggcgga
tcacctgaggtcaggagtttgagaccagcctggccaacatggtgaaacgccgtctctact
aaaaatacaaaaattagtcaggcatgatggcaggcgcctgtcatcccagctactagggag
gctgaggcaggagaattgctggaacctgggaggcagaggttgcagtgagccgagatcaca
ccactgcactccagcctgggtaacagagcaagactgcttcaaaaaaaaattttttttaat
taaaaaaaaagtagatgactgcagcaaagaagagatttattagctcttcctttcaaggta