this comparison showed that at least two ump photohydrates form per rna-protein cross-linking event in 30s ribosomes irradiated with a dose of 254-nm radiation ( 1.5 x 10 ( 19 ) quanta ) , which causes cross-linking of only three ribosomal proteins to 16s rrna .
C0035553
ribosomes
C0035552
ribosomal proteins