RNA(n) + a ribonucleoside 5'-diphosphate => RNA(n+1) + phosphate
rna(n) + a ribonucleoside 5'-diphosphate => rna(n+1) + phosphate
RNA(n) + a ribonucleoside 5'-diphosphate => RNA(n+1) + phosphate
rna(n) + a ribonucleoside 5'-diphosphate => rna(n+1) + phosphate