http://en.wikipedia.org/wiki/Terminal_deoxynucleotidyl_transferase
http://us.expasy.org/cgi-bin/lists?pdbtosp.txt
http://en.wikipedia.org/wiki/RNA_replicase
http://en.wikipedia.org/wiki/Spiegelman_Monster
http://molbio.mgh.harvard.edu/szostakweb/publications/Szostak_pdfs/Trevino_et_al_2011_PNAS.pdf
http://journal.frontiersin.org/article/10.3389/fmolb.2016.00020/full
http://depts.washington.edu/loeblabs/pdf/2005_Loh.pdf
http://www.bu.edu/cab/CAB%20PDF/Liang%20et%20al%20Biochemistry%20'04.pdf
http://www.epibio.com/docs/default-source/protocols/terminal-deoxynucleotidyl-transferase-recombinant.pdf?sfvrsn=8
http://www.bc.sinica.edu.tw/MDTsai/2010/CNPII%20349-383.pdf
https://academic.oup.com/nar/advance-article/doi/10.1093/nar/gky296/4990018