Fig. 1

Unrooted neighbor-joining tree depicting the genetic relatedness of full-length envelope sequences from P08 and P11 with the controls. Sequences from P08 and P11 are colored in red, those previously obtained from China are in green, those provided to us by John Mascola of Vaccine Research Center at NIH are in blue, and those commonly used reference sequences for classifying HIV-1 subtypes and CRFs were in black. The branch length is drawn to scale so that the relatedness between different sequences can be readily assessed. Individual sequences are named at the tip of the branches and their assignment to specific subtype or CRF is also indicated