Functional regions and cDNA structures of 2 Pax-5 isoforms. (A) Annealing positions of primers used in RT-PCR, described in Table 1 as 1, 2, etc. (B) Schematic representation of the C-terminal domain of Pax-5a and Pax-5/Δ-Ex8 spliced form displaying positions of primers used in QRT-PCR, described in Table 1 as A, B, etc.