V1V2 length by anatomic site HXB2 posi*on 5771 6615 7637 8341 V1V2 C2 V3 C3 V4 C4 V5 V1V2 length by subtype HIV env subregions V4 length by site V4 length by subtype 0 1000 2000 3000 C2 99 0 2000 4000 6000 V3 35 0 1000 3000 C3 52 V5 by site 0 1000 3000 C4 26 45 49 53 57 61 65 69 73 77 81 85 89 93 97 101 0 100 200 300 CC CS CSF DC PB PL uk Lengths 45 49 53 57 61 65 69 73 77 81 85 89 93 97 101 0 100 200 300 A B C G uk Lengths 15 19 23 27 31 35 39 43 47 51 0 200 400 600 800 1000 CC CS CSF DC PB PL u.k Lengths 15 19 23 27 31 35 39 43 47 51 0 200 400 600 800 1000 A B C G Lengths 20 24 28 32 36 0 200 400 600 800 1000 1200 1400 CC CS CSF DC PB PL u.k Lengths