TABLE 5.

Effect of changing gpA residue 515 on viability of λ cosN⁺ and λ cosN G₂C C₁₁G^a

Group	Amino acid	Viable recombinants on MF1972 for:
		cosN+	cosN G2C C11G
Acidic	D	+	−
	E	+	−
Basic	K	+	−
	R	+	−
Polar uncharged	Q	+	+
	S	+	+
Hydrophobic	A	+	+
	F	+	+
	G	+	+
	I	+	+
	V	+	+
	Y	+	+

^aCrosses were performed in an MF1966 (λ Aam515 cI857) lysogen for the cosN⁺ allele and in an MF1427 (λ cosN G₂C C₁₁G gal⁺ att⁺ cI857) lysogen for the cosN G₂C C₁₁G allele; both were plated on MF1972 for plaques.