As shown below, I have two files a fasta file (containing a sequences and sequence IDs) and a text file containing a list of sequence ID.
I would like to extract the respective sequence for each of the sequence IDs in the text file. I have tried a number of times, but I simply cannot even open the fasta file - I'm a total beginner with regards to bioruby - if you could explain any answers in detail, I would be highly grateful.
EDIT: Could you give your answers using Ruby or BioRuby. Thanks
e.g. EXAMPLE FASTA FILE
>CATH_RAT MWTALPLLCAGAWLLSAGATAELTVNAIEKFHFTSWMKQHQKTYSSREYSHRLQVFANNWRKIQAHNQRN HTFKMGLNQFSDMSFAEIKHKYLWSEPQNCSATKSNYLRGTGPYPSSMDWRKKGNVVSPVKNQGACGSCW >CATH_MOUSE TFSTTGALESAVAIASGKMMTLAEQQLVDCAQNFNNHGCQGGLPSQAFEYILYNKGIMGEDSYPYIGKNG QCKFNPEKAVAFVKNVVNITLNDEAAMVEAVALYNPVSFAFEVTEDFMMYKSGVYSSNSCHKTPDKVNHA >CATH_HUMAN MNPTLILAAFCLGIASATLTFDHSLEAQWTKWKAMHNRLYGMNEEGWRRAVWEKNMKMIELHNQEYREGK HSFTMAMNAFGDMTSEEFRQVMNGFQNRKPRKGKVFQEPLFYEAPRSVDWREKGYVTPVKNQGQCGSCWA >CATH_MONKEY FSATGALEGQMFRKTGRLISLSEQNLVDCSGPQGNEGCNGGLMDYAFQYVQDNGGLDSEESYPYEATEES CKYNPKYSVANDTGFVDIPKQEKALMKAVATVGPISVAIDAGHESFLFYKEGIYFEPDCSSEDMDHGVLV
EXAMPLE .TXT FILE