Proceedings of the National Academy of Sciences

Issue 9 - Issue 9 67 Issue 8 - Issue 8 106 Issue 7 - Issue 7 76 Issue 6 - Issue 6 103 Issue 5 - Issue 5 77 Issue 4 - Issue 4 101 Issue 32 - Issue 32 7 Issue 31 - Issue 31 71 Issue 30 - Issue 30 105 Issue 3 - Issue 3 64 Issue 29 - Issue 29 93 Issue 28 - Issue 28 99 Issue 27 - Issue 27 120 Issue 26 - Issue 26 86 Issue 25 - Issue 25 107 Issue 24 - Issue 24 96 Issue 23 - Issue 23 81 Issue 22 - Issue 22 115 Issue 21 - Issue 21 91 Issue 20 - Issue 20 89 Issue 2 - Issue 2 87 Issue 19 - Issue 19 92 Issue 18 - Issue 18 91 Issue 17 - Issue 17 94 Issue 16 - Issue 16 83 Issue 15 - Issue 15 118 Issue 14 - Issue 14 73 Issue 13 - Issue 13 106 Issue 12 - Issue 12 121 Issue 11 - Issue 11 102 Issue 10 - Issue 10 113 Issue 1 - Issue 1 81

Issue 9 - Issue 9 69 Issue 8 - Issue 8 83 Issue 7 - Issue 7 82 Issue 6 - Issue 6 79 Issue 52 - Issue 52 71 Issue 51 - Issue 51 93 Issue 50 - Issue 50 78 Issue 5 - Issue 5 73 Issue 49 - Issue 49 88 Issue 48 - Issue 48 120 Issue 47 - Issue 47 92 Issue 46 - Issue 46 79 Issue 45 - Issue 45 91 Issue 44 - Issue 44 79 Issue 43 - Issue 43 80 Issue 42 - Issue 42 84 Issue 41 - Issue 41 101 Issue 40 - Issue 40 84 Issue 4 - Issue 4 84 Issue 39 - Issue 39 93 Issue 38 - Issue 38 93 Issue 37 - Issue 37 80 Issue 36 - Issue 36 67 Issue 35 - Issue 35 80 Issue 34 - Issue 34 89 Issue 33 - Issue 33 69 Issue 32 - Issue 32 74 Issue 31 - Issue 31 83 Issue 30 - Issue 30 76 Issue 3 - Issue 3 60 Issue 29 - Issue 29 87 Issue 28 - Issue 28 89 Issue 27 - Issue 27 82 Issue 26 - Issue 26 75 Issue 25 - Issue 25 82 Issue 24 - Issue 24 112 Issue 23 - Issue 23 88 Issue 22 - Issue 22 77 Issue 21 - Issue 21 76 Issue 20 - Issue 20 101 Issue 2 - Issue 2 74 Issue 19 - Issue 19 83 Issue 18 - Issue 18 83 Issue 17 - Issue 17 65 Issue 16 - Issue 16 93 Issue 15 - Issue 15 85 Issue 14 - Issue 14 81 Issue 13 - Issue 13 71 Issue 12 - Issue 12 94 Issue 11 - Issue 11 94 Issue 10 - Issue 10 96 Issue 1 - Issue 1 140