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 = rna(n) + a ribonucleoside 5'-diphosphate