Abstract
The nucleotide sequence of 57 base pairs near the end of the cI gene in phage λ is presented. This sequence was determined by direct sequencing techniques and includes the codons for 11 carboxyterminal aminoacids of the cI product, the λ repressor. The sequence reveals that the cI gene, which has recently been shown to have a unique initiation region, is terminated by a UGA codon. A GUG triplet, which could act as a translational start signal for the rex gene occurs 8 base pairs beyond the cI termination codon. This GUG triplet is preceded by a sequence that could serve as a strong ribosome binding site for the rex message.
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