Fig. 2.

Schematic representation of HIV-1 genome organization. The three coding reading frames are depicted along with their open reading frames (rectangles). Genome position numbering is based on theHXB2 reference strain. The small number in the upper left corner of each rectangle indicates the gene start, while the number in the lower right indicates the last position of the stop codon. Trans-spliced rev and tat forms are represented by black connecting lines between the third and second, and second and first open reading frames, respectively.