DNA sequence is enzymatically copied by RNA polymerase to produce a complementary nucleotide RNA strand , called messenger RNA -LRB- mRNA -RRB- , because it carries a genetic message from the MISC@1 to the protein-synthesizing machinery of the cell .

This is called messenger RNA -LRB- mRNA -RRB- , because it carries a genetic message from the MISC@1 to the protein-making machinery of the cell .
