our work exploited the availability of radioactive dna ( cdna ( gp ) ) complementary to most or all of env . env sequences were detectable in the dnas of chickens which synthesized an env gene product ( chick helper factor positive ) encoded by an endogenous viral gene and also in the dnas of chickens which synthesized little or no env gene product ( chick helper factor negative ) .
C0017376
viral gene
C0017278
env gene product