Hi I want to extract sequences after a motif say "TTTTTAAAAA" from a multifasta file. I do not want the nucleotides before this keyword. Is it possible to extract nucleotides between 2 motifs with grep? eg. nucleotides between TTTTTAAAA & AAAATTTT. I tried with grep but I need the fasta headers also. Can anybody suggest a solution in grep (if possible) or perl or python.