TABLE 2.

DNA homology between β-lactamases of group 2c genes

β-Lac- tamase	% Homology
	PSE-4	CARB-3	CARB-4	PSE-3	AER-1	PSE-1	N-29	GN79
CARB-3	99.78
CARB-4	86.39	86.39
PSE-3	50.46	50.73	49.54
AER-1	50.44	50.33	51.41	60.76
PSE-1	99.89	99.89	86.51	50.59	50.59
N-29	98.73	98.73	86.28	50.46	50.59	98.85
GN79	53.33	53.10	54.98	53.54	50.00	53.29	52.83
BRO-1	48.89	48.89	48.94	46.61	42.72	48.71	49.06	49.87