label: a 3'-end 2'-deoxyribonucleotidyl-deoxyribonucleotide-DNA + H2O => a 3'-end 2'-deoxyribonucleotide-DNA + a 2'-deoxyribonucleoside 5'-phosphate + H(+)
label_lc: a 3'-end 2'-deoxyribonucleotidyl-deoxyribonucleotide-dna + h2o => a 3'-end 2'-deoxyribonucleotide-dna + a 2'-deoxyribonucleoside 5'-phosphate + h(+)