to approach this question , we compared the kinetics of expression of ebv nuclear antigens and the two ebv-encoded small rnas , eber1 and eber2 , after infection of primary b cells or ebv genome-negative bl cells with either an immortalizing ebv strain ( b95-8 ) or the nonimmortalizing deletion mutant ( hr-1 ) .
C0004561
b cells
C0006413
bl