in stringent conditions ( 300 mm nacl or 20 degrees c ) only 9 e. coli ribosomal proteins strongly bound to the 16s rrna : s4 , s5 , s7 , s9 , s12 , s13 , s14 , s19 , s20 .
C0035553
ribosomal
C3537372
16s rrna