Translational efficiency of an AUG, CUG, GUG, or UUG initiation codon was measured for the naturally leaderless cI mRNA from bacteriophage λ. In a cI-lacZ translational fusion, only AUG supported a hi
d = depleted; nd = non-depleted; td = doubling time; g.y. = growth yield; s.d. = standard deviation, bold print = phenotypes; equal = equal to the wild-type;* = these values are not related to the wil