Phylogenetic Classification and the Universal Tree

W. F. Doolittle
1999 Science  
observation led to the study of the (L)-␣-threofuranosyl-(2Ј33Ј) oligonucleotide system (Fig. 1, bottom right) , which, according to recent observations, is in fact a weak pairing system [see (47) ].
doi:10.1126/science.284.5423.2124 pmid:10381871 fatcat:froc73ea6jgtro57hr22vtwcr4