FIG. 8.

Proposed model for the function of the BPV-1 ESEs and ESSs in regulation of BPV-1 alternative splicing. 3′ ss, 3′ splice site; 5′ ss, 5′ splice site; ?, hypothetical factor(s); solid circles, BPS; +, enhances splicing; −, suppresses splicing. Arrows indicate sites at which elements function.