horovitz follows 16s rrna structure meyer
rna loops bulges junctions stems strands
rrna secondary 16s nucleotides photoaffinity
rna secondary structure structures 3d 2d dssr trna phenylalanine yeast example defining software turn motifs crystal
rna structure function protein trna dna synthesis pairing single molecule base stranded mrna diagram labeled parts amino strand acid shape
16s rrna coli mutations modification transcriptional analyzed identities indicated