| role of methylation in the induced and spontaneous expression of the avian endogenous virus ev-1: dna structure and gene products. | the endogenous avian provirus ev-1 is widespread in white leghorn chickens. although it has no major structural defects, ev-1 has not been associated with any phenotype and is ordinarily expressed at a very low level. in this report, we describe a chicken embryo (number 1836) cell culture containing both ev-1 and ev-6 which spontaneously expressed the ev-1 provirus. this culture released a high level of noninfectious virions containing a full complement of virion structural (gag) proteins but de ... | 1982 | 14582159 |