Figure 3.

Distinct internal composition of INS regions in the GAG/POL-ORF of HXB2R. To the right of the weight matrix name, INS motif matches are indicated as symbols as described in Figure 4. The corresponding INS element names are depicted above and the INS regions indicated below. Reading frames [p17^gag, p24^gag, p15^gag, protease, reverse-transcriptase (p66RT), integrase] and the corresponding INS regions (INS1, INS2, INS3 and CRS) containing experimentally identified and verified INS elements are indicated.