a tRNA with a 3' CCA end + 3 diphosphate => a tRNA precursor + 2 CTP + ATP
a trna with a 3' cca end + 3 diphosphate => a trna precursor + 2 ctp + atp
a tRNA with a 3' CCA end + 3 diphosphate => a tRNA precursor + 2 CTP + ATP
a trna with a 3' cca end + 3 diphosphate => a trna precursor + 2 ctp + atp