Untranslated Nucleotide Sequence at the 5′-End of R 17 Bacteriophage RNA

The 5′-terminal sequence of 74 nucleotides reported here does not seem to be involved in the synthesis of phage specific proteins but is probably concerned in the replication of R17 RNA. It is also of comparative interest—the sequence is strikingly similar to the corresponding section of Qβ phage RNA.