In Wilk et al. 2001 I saw that HIV has 3 open reading frames. In the Watts et al. 2009, I noticed they mentioned HIV has 9 open reading frames. I don't understand this very well.
e.g.
[ATG] GAT GTA AGT
A[TG G]AT GTA AGT
AT[G GA]T GTA AGT
Could anyone explain this to me?