Adenovirus E3 region protein CR2
Early region 3 (E3) of human adenoviruses (Ads) codes for proteins that appear to control viral interactions with the host. This region called CR2 (conserved region 1) is found in Adenovirus type 19 (a subgroup D virus) 49 Kd protein in the E3 region. CR2 is also found in the 20.1 Kd protein of subgroup B adenoviruses. The function of this 50 amino acid region is unknown.