TABLE 1.

Genotypes and phenotypes of φX174 J mutants in these studies

Mutant	Genotype	Phenotype
J−3K→LI	K→L at residues 2, 4, and 5	Small plaques, ts, csa
su(J)-FS1F/J−3K→LI	K→L at residues 2, 4, and 5; extragenic suppressor (S→F) in residue 1 of the capsid protein	Wild type
J−K→L ALL	K→L at residues 2, 4, 5, 21, 23, and 25	Recessive lethal

^ats and cs denote temperature-sensitive and cold-sensitive phenotypes, respectively.