E1A and E1B in resting and stimulated lymphocytes. (A) Stimulation of T and B cells. Sense primers specific for CD5 E1A, E1B, and exon 2, with antisense primers located at the exons 5-6 junction, were used in RT-PCR. (B) Expression of E1A, E1B, and exon 2 transcripts in B cells from different sources (CLL, chronic lymphocytic leukemia; PB, peripheral blood; tonsil, tonsillar cells; CB, cord blood).