preferred_name: a tRNA with a 3' CCA end + diphosphate => a tRNA with a 3' CC end + ATP
preferred_name_lc: a trna with a 3' cca end + diphosphate => a trna with a 3' cc end + atp
label: a tRNA with a 3' CCA end + diphosphate => a tRNA with a 3' CC end + ATP
label_lc: a trna with a 3' cca end + diphosphate => a trna with a 3' cc end + atp