TABLE 3.

Genetic composition of recombinant viruses

Designation	Amino acida
	PA		NP				M		PB2
	431	497	55	114	410	509	159	183	630
MDV-B	M	H	A	A	H	T	Q	V	R
R1 (MDV-B)	M	H	A	A	H	T	Q	V	R
R2 (WT PA)	V	Y	A	A	H	T	Q	V	R
R3 (WT NP)	M	H	T	V	P	A	Q	V	R
R4 (WT M)	M	H	A	A	H	T	H	M	R
R5 (WT PA/M)	V	Y	A	A	H	T	H	M	R
R6 (WT NP/M)	M	H	T	V	P	A	H	M	R
R7 (WT PA/NP)	V	Y	T	V	P	A	Q	V	R
R8 (WT PA/NP/M)	V	Y	T	V	P	A	H	M	R
R9	V	Y	T	A	H	T	Q	V	R
R10	V	Y	A	V	H	T	Q	V	R
R11	V	Y	A	A	P	T	Q	V	R
R12	V	Y	A	A	H	A	Q	V	R
R13	V	Y	A	V	P	T	Q	V	R
R14	V	H	T	V	P	A	H	M	R
R15	M	Y	T	V	P	A	H	M	R
R16	V	H	A	V	P	T	Q	V	R
R17	V	H	A	V	P	T	H	V	R
R18	V	H	A	V	P	T	Q	M	R
R19	V	H	A	V	P	T	H	M	R
R20	V	Y	T	V	P	A	H	M	S

^aThe amino acid at the indicated position is given for each gene segment. Wild-type residues are indicated in boldface.