Messenger RNAs are RNA molecules that carry the "message" from the DNA to the ribosomes to be translated into protein. The "message" in mRNA is carried in groups of three nucleotides called codons. Each codon specifies one amino acid in a protein according to the rules of the genetic code.
See also: Transcription, Translation, RNA Polymerases, Background
on Transcription, RNA
Polymerase II Transcription, Eukaryotic
Transcription,