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