I want to differentiate mRNA sequence from other Sequences. I found $seqobj->moltype will always give me 'dna' value even if the sequence is mRNA type on the first line of genbank record. How to get the mRNA value fo error checking purpose? Henry Lu Bioinformatics Scientist Epigenesis Pharmaceuticals Find the best deals on the web at AltaVista Shopping! http://www.shopping.altavista.com