What is a unique mono-nucleotide of the RNA? Is it GMP AMP TMP CMP or UMP

thanks

Since this is not my area of expertise, I searched Google under the key words "mononucleotide RNA" to get these possible sources:

http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=10397790&query_hl=21&itool=pubmed_docsum
http://mcb.asm.org/cgi/reprint/25/9/3583.pdf
http://cat.inist.fr/?aModele=afficheN&cpsidt=14850154
http://www.springerlink.com/content/wp554n8057285177/
http://www.pathlights.com/ce_encyclopedia/sci-ev/sci_vs_ev_8.htm

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.