rII cistrons of bacteriophage T4

An 873 base-pair DNA sequence from the rII region of bacteriophage T4 is presented. The sequence encodes 139 carboxyl-terminal amino acids of rIIA and the amino-terminal 146 amino acids of rIIB. Eleven base-pairs separate the rIIA stop codon (UAA) and the rIIB AUG. An extensive genetic map is superimposed on the DNA sequence, showing the deduced locations of many of the mutations (base-pair substitutions, frameshifts, deletions) found in previous rII genetic studies.