tRNA(n+1) + phosphate = tRNA(n) + a ribonucleoside 5'-diphosphate
trna(n+1) + phosphate = trna(n) + a ribonucleoside 5'-diphosphate
tRNA(n+1) + phosphate = tRNA(n) + a ribonucleoside 5'-diphosphate
trna(n+1) + phosphate = trna(n) + a ribonucleoside 5'-diphosphate