TABLE 1.

Percentages of sequence identities between shuffled genes

Gene	% Identitya
	S. clavuligerus cefE	S. jumonjinensis cefE	N. lactamdurans cefE	A. chrysogenum cefEF	S. ambofaciens (102SH3) cefE	S. chartreusis (29SA4) cefE	S. clavuligerus cefF	Isolate 65PH1 cefF
S. clavuligerus cefE		81	70	56	81	76	58	60
S. jumonjinensis cefE	83		68	55	85	77	58	60
N. lactamdurans cefE	74	74		58	70	67	58	61
A. chrysogcnum cefEF	66	61	68		57	57	52	53
S. ambofaciens (102SH3) cefE	82	86	74	61		79	57	60
S. chartreusis (29SA4) cefE	79	82	73	67	82		55	60
S. clavuligerus cefF	69	69	72	60	66	69		77
Isolate 65PH1 cefF	72	72	72	59	70	71	83

^aPercentages in the lower left diagonal half of the table are nucleotide sequence identities; percentages in the upper right diagonal half are identities of deduced amino acid sequences.