a tRNA with a 3' CC end + ATP = a tRNA with a 3' CCA end + diphosphate
a trna with a 3' cc end + atp = a trna with a 3' cca end + diphosphate
a tRNA with a 3' CC end + ATP = a tRNA with a 3' CCA end + diphosphate
a trna with a 3' cc end + atp = a trna with a 3' cca end + diphosphate