preferred_name: a tRNA precursor + 2 CTP <=> a tRNA with a 3' CC end + 2 diphosphate
preferred_name_lc: a trna precursor + 2 ctp <=> a trna with a 3' cc end + 2 diphosphate
label: a tRNA precursor + 2 CTP <=> a tRNA with a 3' CC end + 2 diphosphate
label_lc: a trna precursor + 2 ctp <=> a trna with a 3' cc end + 2 diphosphate