Table 1. Protein products potentially expressed from early region constructs.

Possible protein products expressed from both SV40.ER and SV40.ERΔVHR constructs are equivalent. Truncation of the VHR in JCV.ER removes two 3′ splice sites, which prevents expression of the T′165 and T′136 proteins.

Expected Protein Products
SV40.ER	SV40.ERΔVHR
Large T	Large T ΔVHR
small T	small T
17kT	17kT
JCV.ER	JCV.ERΔVHR
Large T	Large T ΔVHR
small T	small T
T′165 T′136 T′135	T′135