internal initiation sites which are similarly inactive have also been detected in other viral rnas ( e.g. , brome mosaic virus , tobacco mosaic virus , and polyoma 19s rna ) and this suggests that , although eukaryotic mrnas can contain more than one initiation site for protein synthesis , only the site nearer the 5 ' terminus is active in vitro .
C0035668
rna
C0597295
protein