TABLE 1.

Primers used to isolate novel retroviral sequences

Primer pool	Orientation	Sequence (5′ to 3′)a	Degeneracyb	Length (nt)
PQGWA	Sense	TACCAGTGGAACGTTCTGCCNCARGGNTGG	32	30
PQGMA	Sense	TACCAGTGGAACGTTCTGCCNCARGGNATG	32	30
PQGFA	Sense	TACCAGTGGAACGTTCTGCCNCARGGNTT	32	29
YMDDB	Antisense	GTAGTCTGATCCTACCAACADRTCRTCCATRTA	24	33

^aN = A, T, C, G; R = A, G; D = A, G, T. Residues marked in bold and underlined represent the unique residues which code for either W, M, or F. These residues define the specificity of the oligonucleotide pool. 

^bThe number of different primers in the pool representing all codon possibilities at the degenerate positions indicated by N, R, or D.