TABLE 4.

Plating phenotypes of λSam recombinants

S allele	Plating efficiencya	Plaque morphologyb	Relative burst sizec
S105	1	Large	1.0
S105 D103am	1	Tiny	1.0
S105 E102am	1	Large	1.0
S105 K97am	10−4	Tiny	0.2
S105 K92am	10−7

^aPFU per milliliter, as determined by titering on MC4100, divided by particles per milliliter, as determined by passive lysogeny assay. The result was normalized to the value for the S105 parental allele as 1.0. 

^bLarge, ≥2 mm; tiny, ≤0.2 mm. 

^cNumber of particles produced per cell after thermal induction of MC4100 lysogen; the value was normalized to the value for the S105 parental as 1.0.