Supplementary Material:



                    6234     6237.7       6245       6255       6265       6287       6297       6307       6317
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      atgagagtga aggggatcag gaagaattat cagcacttgt ggagatgggg caccatgctc cttgggatgt tgatgatctg tagtgctgca   [90]
               M  R  V   K  G  I  R   K  N  Y   Q  H  L   W  R  W  G   T  M  L   L  G  M   L  M  I  C   S  A  A    [30]

                    6327       6337       6347       6357       6367       6377       6387       6397       6407
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      gaaaaattgt gggtcacagt ctattatggg gtacctgtgt ggaaagaagc aaccaccact ctattttgtg catcagatgc taaagcatat   [180]
               E  K  L   W  V  T  V   Y  Y  G   V  P  V   W  K  E  A   T  T  T   L  F  C   A  S  D  A   K  A  Y    [60]

                    6417       6427       6437       6447       6457       6467       6477       6487       6497
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      gatacagagg tacataatgt ttgggccaca catgcctgtg tacccacaga ccccaaccca caagaagtag tattggaaaa tgtgacagaa   [270]
               D  T  E   V  H  N  V   W  A  T   H  A  C   V  P  T  D   P  N  P   Q  E  V   V  L  E  N   V  T  E    [90]

                    6507       6517       6527       6537       6547       6557       6567       6577       6587
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      aattttaaca tgtggaaaaa taacatggta gaacagatgc atgaggatat aatcagttta tgggatcaaa gcctaaagcc atgtgtaaaa   [360]
               N  F  N   M  W  K  N   N  M  V   E  Q  M   H  E  D  I   I  S  L   W  D  Q   S  L  K  P   C  V  K    [120]

                    6597       6607       6617       6624       6631       6641     6643.8    6643.18       6644
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      ttaaccccac tctgtgttac tttaaattgc actgatgatt tgaggactaa tgctactaat accaccaata gtagtgctac cactaatacc   [450]
               L  T  P   L  C  V  T   L  N  C   T  D  D   L  R  T  N   A  T  N   T  T  N   S  S  A  T   T  N  T    [150]

                    6654       6664     6674.3       6681       6691       6701       6711       6721       6731
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      actagtagtg gggggggaac gatggagggg gaaaaaggag aaataaaaaa ctgctctttc aatgtcacca caagcataag agataagatg   [540]
               T  S  S   G  G  G  T   M  E  G   E  K  G   E  I  K  N   C  S  F   N  V  T   T  S  I  R   D  K  M    [180]

                    6741       6751       6761       6771       6781     6789.2    6789.12       6793       6803
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      cagaaagaat atgcactttt ttataaactt gatgtagtac caatagataa tgataataat aacactaata ataataccag ctataggttg   [630]
               Q  K  E   Y  A  L  F   Y  K  L   D  V  V   P  I  D  N   D  N  N   N  T  N   N  N  T  S   Y  R  L    [210]

                    6813       6823       6833       6843       6853       6863       6873       6883       6893
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      ataaattgta acacctcagt cattacacag gcctgtccaa aggtatcctt tgagccaatt cccatacatt attgtacccc ggctggtttt   [720]
               I  N  C   N  T  S  V   I  T  Q   A  C  P   K  V  S  F   E  P  I   P  I  H   Y  C  T  P   A  G  F    [240]

                    6903       6913       6923       6933       6943       6953       6963       6973       6983
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      gcgattctaa agtgtaatga taagaagttc aatggaacag gaccatgtac aaatgtcagc acagtacaat gtacacatgg aattaggcca   [810]
               A  I  L   K  C  N  D   K  K  F   N  G  T   G  P  C  T   N  V  S   T  V  Q   C  T  H  G   I  R  P    [270]

                    6993       7003       7013       7023       7033       7043       7053       7063       7073
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      gtagtgtcaa ctcaactgct gttaaatggc agtctagcag aagaagaggt agtaattaga tctgaaaatt tcacggacaa tgctaaaacc   [900]
               V  V  S   T  Q  L  L   L  N  G   S  L  A   E  E  E  V   V  I  R   S  E  N   F  T  D  N   A  K  T    [300]

                    7083       7093       7103       7113       7123       7133       7143       7157       7169
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      ataatagtac agctgaatga atctgtagaa attaattgta caagacccaa caacaataca agaaaaagta tacctatagg accagggaga   [990]
               I  I  V   Q  L  N  E   S  V  E   I  N  C   T  R  P  N   N  N  T   R  K  S   I  P  I  G   P  G  R    [330]

                    7179       7189       7196       7206       7216       7226       7236       7246       7256
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      gcactttatg caacaggaaa aataatagga gatataagac aagcacattg taaccttagt agagcaaaat ggaataacac tttaaaacag   [1080]
               A  L  Y   A  T  G  K   I  I  G   D  I  R   Q  A  H  C   N  L  S   R  A  K   W  N  N  T   L  K  Q     [360]

                    7266       7276       7286       7296       7303       7313       7323       7333       7343
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      atagttacaa aattaagaga acaatttggg aataataaaa caacaatagt ctttaatcaa tcctcaggag gggacccaga aattgtaatg   [1170]
               I  V  T   K  L  R  E   Q  F  G   N  N  K   T  T  I  V   F  N  Q   S  S  G   G  D  P  E   I  V  M     [390]

                    7353       7363       7373       7383       7393       7403       7410       7420     7426.4
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      cacagtttta attgtggagg ggaatttttc tactgtaatt caacacaact gtttaatagt acttggcatt ttaatggtac ttgggggaat   [1260]
               H  S  F   N  C  G  G   E  F  F   Y  C  N   S  T  Q  L   F  N  S   T  W  H   F  N  G  T   W  G  N     [420]

                    7431       7441       7451       7458       7468       7478       7488       7498       7508
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      aataatactg aaaggtcaaa taacgctgca gatgataatg acactatcac actcccatgc agaataaaac aaattataaa catgtggcag   [1350]
               N  N  T   E  R  S  N   N  A  A   D  D  N   D  T  I  T   L  P  C   R  I  K   Q  I  I  N   M  W  Q     [450]

                    7518       7528       7538       7548       7558       7568       7578       7588       7598
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      gaagtaggaa aagcaatgta tgcccctccc atcagtggac aaattagatg ttcatcaaat attacagggc tactattaac aagagatggt   [1440]
               E  V  G   K  A  M  Y   A  P  P   I  S  G   Q  I  R  C   S  S  N   I  T  G   L  L  L  T   R  D  G     [480]

                  7607.1       7609       7616       7626       7636       7646       7656       7666       7676
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      ggtaataatg agaacacgaa caataccgac actgagatct tcagacctgg aggaggagat atgagggaca attggagaag tgaattatat   [1530]
               G  N  N   E  N  T  N   N  T  D   T  E  I   F  R  P  G   G  G  D   M  R  D   N  W  R  S   E  L  Y     [510]

                    7686       7696       7706       7716       7726       7736       7746       7756       7766
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      aaatataaag tagtaaaaat tgaaccatta ggagtagcac ccaccaaggc aaagagaaga gtggtgcaga gagaaaaaag agcagtggga   [1620]
               K  Y  K   V  V  K  I   E  P  L   G  V  A   P  T  K  A   K  R  R   V  V  Q   R  E  K  R   A  V  G     [540]

                    7773       7783       7793       7803       7813       7823       7833       7843       7853
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      atgctaggag ctatgttcct tgggttcttg ggagcagcag gaagcactat gggcgcagcg tcaatgacgc tgacggtaca ggccagacaa   [1710]
               M  L  G   A  M  F  L   G  F  L   G  A  A   G  S  T  M   G  A  A   S  M  T   L  T  V  Q   A  R  Q     [570]

                    7863       7873       7883       7893       7903       7913       7923       7933       7943
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      ttattgtctg gtatagtgca acagcagaac aatttgctga gggctattga ggcgcaacag catctgttgc aactcacagt ctggggcatc   [1800]
               L  L  S   G  I  V  Q   Q  Q  N   N  L  L   R  A  I  E   A  Q  Q   H  L  L   Q  L  T  V   W  G  I     [600]

                    7953       7963       7973       7983       7993       8003       8013       8023       8033
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      aaacagctcc aggcaagagt cctggctgtg gaaagatacc taaaggatca acagctccta gggatttggg gttgctctgg aaaactcatc   [1890]
               K  Q  L   Q  A  R  V   L  A  V   E  R  Y   L  K  D  Q   Q  L  L   G  I  W   G  C  S  G   K  L  I     [630]

                    8043       8053       8063       8073       8083       8093       8103       8113       8123
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      tgcaccactg ctgtgccttg gaatgctagt tggagtaata aatctctgga taagatttgg aataacatga cctggatgga gtgggaaaga   [1980]
               C  T  T   A  V  P  W   N  A  S   W  S  N   K  S  L  D   K  I  W   N  N  M   T  W  M  E   W  E  R     [660]

                    8133       8143       8153       8163       8173       8183       8193       8203       8213
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      gaaattgaca attacacagg cttaatatac accttaattg aagaatcgca gaaccaacaa gaaaagaatg aacaagaatt attggaattg   [2070]
               E  I  D   N  Y  T  G   L  I  Y   T  L  I   E  E  S  Q   N  Q  Q   E  K  N   E  Q  E  L   L  E  L     [690]

                    8223       8233       8243       8253       8263       8273       8283       8293       8303
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      gataagtggg caagtttgtg gaattggttt gacataacaa actggctgtg gtatataaaa atattcataa tgatagtagg aggcttggta   [2160]
               D  K  W   A  S  L  W   N  W  F   D  I  T   N  W  L  W   Y  I  K   I  F  I   M  I  V  G   G  L  V     [720]

                    8313       8323       8333       8343       8353       8363       8373       8383       8393
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      ggtttaagaa tagtttttgc tgtactttct atagtgaata gagttaggca gggatactca ccattatcgt ttcagacccg cctcccagcc   [2250]
               G  L  R   I  V  F  A   V  L  S   I  V  N   R  V  R  Q   G  Y  S   P  L  S   F  Q  T  R   L  P  A     [750]

                    8403       8413       8423       8433       8443       8453       8463       8473       8483
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      ccgaggggac ccgacaggcc cgaaggaatc gaagaagaag gtggagagag agacagagac agatccggtc gattagtgaa tggattctta   [2340]
               P  R  G   P  D  R  P   E  G  I   E  E  E   G  G  E  R   D  R  D   R  S  G   R  L  V  N   G  F  L     [780]

                    8493       8503       8513       8523       8533       8543       8553       8563       8573
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      gcacttatct gggacgacct gcggagcctg tgcctcttca gctaccaccg cttgagagac ttactcttga ttgtagcgag gattgtggaa   [2430]
               A  L  I   W  D  D  L   R  S  L   C  L  F   S  Y  H  R   L  R  D   L  L  L   I  V  A  R   I  V  E     [810]

                    8583       8593       8603       8613       8623       8633       8643       8653       8663
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      cttctgggac gcagggggtg ggaagccctc aaatattggt ggaatctcct gcagtattgg agtcaggaac taaagaatag tgctgttagc   [2520]
               L  L  G   R  R  G  W   E  A  L   K  Y  W   W  N  L  L   Q  Y  W   S  Q  E   L  K  N  S   A  V  S     [840]

                    8673       8683       8693       8703       8713       8723       8733       8743       8753
                       .          .          .          .          .          .          .          .          .
AN1-EnvB      ttgcttaatg ccacagctat agcagtagct gaggggacag atagggttat agaagtagta caaagagctt gtagagctat tctccacata   [2610]
               L  L  N   A  T  A  I   A  V  A   E  G  T   D  R  V  I   E  V  V   Q  R  A   C  R  A  I   L  H  I     [870]

                    8763       8773       8783       8793
                       .          .          .          .
AN1-EnvB      cctagaagaa taagacaggg cttagaaagg gctttgctat aa   [2652]
               P  R  R   I  R  Q  G   L  E  R   A  L  L   *     [883]


FIG 2. Subtype B MRCA: Nucleotide and inferred amino acid sequence of AN1env. Numbers above the alignment indicate positions relative to the sequence of HIV HXB2 (GenBank accession number K03455).