Abstract
The 6407 nucleotide-long sequence of bacteriophage M13 DNA has been determined using both the chemical degradation and chain-termination methods of DNA sequencing. This sequence has been compared with that of the closely related bacteriophage fd (Beck et al., 1978). M13 DNA appears to be only a single nucleotide shorter than fd DNA. There is an average of 3.0% of nucleotide-sequence differences between the two genomes, but the distribution of these changes is not random; the sequence of some genes is more conserved than of others. In contrast, the nucleotide sequences and positions of the regulatory elements involved in transcription, translation and replication appear to be identical in both filamentous phage DNA genomes.
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