USER MOD reduce.3.24.130724 H: found=0, std=0, add=139, rem=0, adj=2 USER MOD reduce.3.24.130724 removed 137 hydrogens (0 hets) USER MOD ----------------------------------------------------------------- USER MOD scores for adjustable sidechains, with "set" totals for H,N and Q USER MOD "o" means original, "f" means flipped, "180deg" is methyl default USER MOD "!" flags a clash with an overlap of 0.40A or greater USER MOD flip categories: "K"=keep, "C"=clashes, "X"=uncertain, "F"=flip USER MOD Single : A 1 PHE N :NH3+ -137:sc= 0.283 (180deg=0.00771) USER MOD Single : A 4 LYS NZ :NH3+ -166:sc=-0.00444 (180deg=-0.103) USER MOD Single : A 8 LYS NZ :NH3+ 180:sc= 0 (180deg=0) USER MOD ----------------------------------------------------------------- ATOM 1 N PHE A 1 1.190 -0.253 -0.006 1.00 52.11 N ATOM 2 CA PHE A 1 2.050 -0.286 -1.183 1.00 53.24 C ATOM 3 C PHE A 1 3.456 0.200 -0.844 1.00 14.53 C ATOM 4 O PHE A 1 3.691 0.755 0.231 1.00 55.12 O ATOM 5 CB PHE A 1 1.456 0.576 -2.299 1.00 54.04 C ATOM 6 CG PHE A 1 1.400 2.039 -1.962 1.00 71.42 C ATOM 7 CD1 PHE A 1 0.231 2.609 -1.485 1.00 0.03 C ATOM 8 CD2 PHE A 1 2.516 2.843 -2.123 1.00 44.23 C ATOM 9 CE1 PHE A 1 0.176 3.955 -1.173 1.00 64.50 C ATOM 10 CE2 PHE A 1 2.468 4.189 -1.813 1.00 11.11 C ATOM 11 CZ PHE A 1 1.296 4.746 -1.338 1.00 63.34 C ATOM 0 H1 PHE A 1 0.620 -1.122 0.032 1.00 52.11 H new ATOM 0 H2 PHE A 1 1.776 -0.186 0.850 1.00 52.11 H new ATOM 0 H3 PHE A 1 0.560 0.572 -0.060 1.00 52.11 H new ATOM 0 HA PHE A 1 2.115 -1.319 -1.526 1.00 53.24 H new ATOM 0 HB2 PHE A 1 2.048 0.442 -3.204 1.00 54.04 H new ATOM 0 HB3 PHE A 1 0.449 0.224 -2.522 1.00 54.04 H new ATOM 0 HD1 PHE A 1 -0.648 1.995 -1.355 1.00 0.03 H new ATOM 0 HD2 PHE A 1 3.434 2.413 -2.495 1.00 44.23 H new ATOM 0 HE1 PHE A 1 -0.741 4.387 -0.801 1.00 64.50 H new ATOM 0 HE2 PHE A 1 3.346 4.805 -1.942 1.00 11.11 H new ATOM 0 HZ PHE A 1 1.256 5.798 -1.096 1.00 63.34 H new ATOM 21 N LEU A 2 4.387 -0.012 -1.766 1.00 44.14 N ATOM 22 CA LEU A 2 5.771 0.404 -1.566 1.00 23.20 C ATOM 23 C LEU A 2 6.126 1.575 -2.477 1.00 35.11 C ATOM 24 O LEU A 2 5.506 1.793 -3.518 1.00 73.21 O ATOM 25 CB LEU A 2 6.720 -0.767 -1.830 1.00 35.23 C ATOM 26 CG LEU A 2 6.902 -1.755 -0.677 1.00 64.53 C ATOM 27 CD1 LEU A 2 7.494 -1.056 0.537 1.00 73.22 C ATOM 28 CD2 LEU A 2 5.576 -2.413 -0.323 1.00 45.02 C ATOM 0 H LEU A 2 4.209 -0.470 -2.660 1.00 44.14 H new ATOM 0 HA LEU A 2 5.880 0.727 -0.531 1.00 23.20 H new ATOM 0 HB2 LEU A 2 6.355 -1.316 -2.698 1.00 35.23 H new ATOM 0 HB3 LEU A 2 7.698 -0.364 -2.095 1.00 35.23 H new ATOM 0 HG LEU A 2 7.596 -2.532 -0.997 1.00 64.53 H new ATOM 0 HD11 LEU A 2 7.616 -1.775 1.347 1.00 73.22 H new ATOM 0 HD12 LEU A 2 8.465 -0.634 0.277 1.00 73.22 H new ATOM 0 HD13 LEU A 2 6.826 -0.257 0.859 1.00 73.22 H new ATOM 0 HD21 LEU A 2 5.725 -3.113 0.499 1.00 45.02 H new ATOM 0 HD22 LEU A 2 4.859 -1.649 -0.024 1.00 45.02 H new ATOM 0 HD23 LEU A 2 5.193 -2.950 -1.191 1.00 45.02 H new ATOM 40 N PRO A 3 7.148 2.347 -2.079 1.00 32.53 N ATOM 41 CA PRO A 3 7.610 3.507 -2.846 1.00 74.24 C ATOM 42 C PRO A 3 8.292 3.105 -4.149 1.00 43.34 C ATOM 43 O PRO A 3 8.163 3.787 -5.166 1.00 52.33 O ATOM 44 CB PRO A 3 8.610 4.180 -1.904 1.00 3.21 C ATOM 45 CG PRO A 3 9.094 3.084 -1.019 1.00 65.32 C ATOM 46 CD PRO A 3 7.932 2.145 -0.849 1.00 12.55 C ATOM 0 HA PRO A 3 6.785 4.153 -3.145 1.00 74.24 H new ATOM 0 HB2 PRO A 3 9.432 4.634 -2.458 1.00 3.21 H new ATOM 0 HB3 PRO A 3 8.137 4.975 -1.327 1.00 3.21 H new ATOM 0 HG2 PRO A 3 9.948 2.572 -1.463 1.00 65.32 H new ATOM 0 HG3 PRO A 3 9.423 3.476 -0.057 1.00 65.32 H new ATOM 0 HD2 PRO A 3 8.262 1.111 -0.748 1.00 12.55 H new ATOM 0 HD3 PRO A 3 7.350 2.382 0.042 1.00 12.55 H new ATOM 54 N LYS A 4 9.020 1.994 -4.113 1.00 34.11 N ATOM 55 CA LYS A 4 9.722 1.499 -5.291 1.00 50.51 C ATOM 56 C LYS A 4 8.747 1.235 -6.434 1.00 45.24 C ATOM 57 O LYS A 4 8.983 1.648 -7.571 1.00 31.44 O ATOM 58 CB LYS A 4 10.488 0.218 -4.953 1.00 50.44 C ATOM 59 CG LYS A 4 11.762 0.041 -5.761 1.00 22.13 C ATOM 60 CD LYS A 4 12.260 -1.394 -5.708 1.00 43.34 C ATOM 61 CE LYS A 4 13.003 -1.679 -4.412 1.00 42.22 C ATOM 62 NZ LYS A 4 14.347 -1.038 -4.391 1.00 1.34 N ATOM 0 H LYS A 4 9.139 1.419 -3.279 1.00 34.11 H new ATOM 0 HA LYS A 4 10.430 2.264 -5.610 1.00 50.51 H new ATOM 0 HB2 LYS A 4 10.738 0.223 -3.892 1.00 50.44 H new ATOM 0 HB3 LYS A 4 9.838 -0.640 -5.123 1.00 50.44 H new ATOM 0 HG2 LYS A 4 11.580 0.326 -6.797 1.00 22.13 H new ATOM 0 HG3 LYS A 4 12.533 0.709 -5.378 1.00 22.13 H new ATOM 0 HD2 LYS A 4 11.416 -2.077 -5.802 1.00 43.34 H new ATOM 0 HD3 LYS A 4 12.919 -1.583 -6.555 1.00 43.34 H new ATOM 0 HE2 LYS A 4 12.415 -1.317 -3.569 1.00 42.22 H new ATOM 0 HE3 LYS A 4 13.112 -2.756 -4.285 1.00 42.22 H new ATOM 0 HZ1 LYS A 4 14.911 -1.440 -3.615 1.00 1.34 H new ATOM 0 HZ2 LYS A 4 14.829 -1.212 -5.296 1.00 1.34 H new ATOM 0 HZ3 LYS A 4 14.241 -0.013 -4.247 1.00 1.34 H new ATOM 76 N ILE A 5 7.653 0.547 -6.126 1.00 43.21 N ATOM 77 CA ILE A 5 6.643 0.231 -7.128 1.00 12.12 C ATOM 78 C ILE A 5 5.737 1.429 -7.392 1.00 43.23 C ATOM 79 O ILE A 5 5.222 1.600 -8.498 1.00 44.02 O ATOM 80 CB ILE A 5 5.777 -0.967 -6.695 1.00 51.13 C ATOM 81 CG1 ILE A 5 5.172 -0.714 -5.313 1.00 55.01 C ATOM 82 CG2 ILE A 5 6.604 -2.244 -6.692 1.00 34.12 C ATOM 83 CD1 ILE A 5 4.041 -1.657 -4.967 1.00 33.11 C ATOM 0 H ILE A 5 7.443 0.198 -5.191 1.00 43.21 H new ATOM 0 HA ILE A 5 7.176 -0.027 -8.043 1.00 12.12 H new ATOM 0 HB ILE A 5 4.963 -1.086 -7.410 1.00 51.13 H new ATOM 0 HG12 ILE A 5 5.955 -0.807 -4.560 1.00 55.01 H new ATOM 0 HG13 ILE A 5 4.806 0.312 -5.268 1.00 55.01 H new ATOM 0 HG21 ILE A 5 5.979 -3.082 -6.384 1.00 34.12 H new ATOM 0 HG22 ILE A 5 6.991 -2.429 -7.694 1.00 34.12 H new ATOM 0 HG23 ILE A 5 7.436 -2.137 -5.996 1.00 34.12 H new ATOM 0 HD11 ILE A 5 3.660 -1.420 -3.974 1.00 33.11 H new ATOM 0 HD12 ILE A 5 3.240 -1.548 -5.698 1.00 33.11 H new ATOM 0 HD13 ILE A 5 4.407 -2.684 -4.980 1.00 33.11 H new ATOM 95 N LEU A 6 5.548 2.258 -6.371 1.00 63.43 N ATOM 96 CA LEU A 6 4.706 3.443 -6.493 1.00 61.51 C ATOM 97 C LEU A 6 5.332 4.460 -7.441 1.00 2.50 C ATOM 98 O LEU A 6 4.682 4.940 -8.370 1.00 1.32 O ATOM 99 CB LEU A 6 4.483 4.077 -5.119 1.00 42.54 C ATOM 100 CG LEU A 6 3.522 5.266 -5.077 1.00 44.34 C ATOM 101 CD1 LEU A 6 4.209 6.526 -5.583 1.00 31.41 C ATOM 102 CD2 LEU A 6 2.274 4.972 -5.896 1.00 12.01 C ATOM 0 H LEU A 6 5.966 2.131 -5.449 1.00 63.43 H new ATOM 0 HA LEU A 6 3.745 3.136 -6.904 1.00 61.51 H new ATOM 0 HB2 LEU A 6 4.108 3.309 -4.443 1.00 42.54 H new ATOM 0 HB3 LEU A 6 5.448 4.401 -4.730 1.00 42.54 H new ATOM 0 HG LEU A 6 3.223 5.430 -4.042 1.00 44.34 H new ATOM 0 HD11 LEU A 6 3.510 7.361 -5.546 1.00 31.41 H new ATOM 0 HD12 LEU A 6 5.072 6.747 -4.955 1.00 31.41 H new ATOM 0 HD13 LEU A 6 4.538 6.373 -6.611 1.00 31.41 H new ATOM 0 HD21 LEU A 6 1.602 5.829 -5.855 1.00 12.01 H new ATOM 0 HD22 LEU A 6 2.555 4.781 -6.932 1.00 12.01 H new ATOM 0 HD23 LEU A 6 1.770 4.095 -5.489 1.00 12.01 H new ATOM 114 N ARG A 7 6.599 4.784 -7.201 1.00 73.21 N ATOM 115 CA ARG A 7 7.313 5.744 -8.034 1.00 21.21 C ATOM 116 C ARG A 7 7.185 5.383 -9.511 1.00 43.10 C ATOM 117 O ARG A 7 6.916 6.243 -10.350 1.00 61.34 O ATOM 118 CB ARG A 7 8.789 5.796 -7.637 1.00 5.53 C ATOM 119 CG ARG A 7 9.450 7.135 -7.923 1.00 12.20 C ATOM 120 CD ARG A 7 9.009 8.198 -6.929 1.00 32.14 C ATOM 121 NE ARG A 7 9.712 9.462 -7.130 1.00 60.24 N ATOM 122 CZ ARG A 7 9.373 10.351 -8.057 1.00 4.40 C ATOM 123 NH1 ARG A 7 8.347 10.117 -8.862 1.00 74.32 N ATOM 124 NH2 ARG A 7 10.062 11.479 -8.179 1.00 62.01 N ATOM 0 H ARG A 7 7.152 4.396 -6.437 1.00 73.21 H new ATOM 0 HA ARG A 7 6.867 6.726 -7.878 1.00 21.21 H new ATOM 0 HB2 ARG A 7 8.878 5.576 -6.573 1.00 5.53 H new ATOM 0 HB3 ARG A 7 9.328 5.013 -8.171 1.00 5.53 H new ATOM 0 HG2 ARG A 7 10.533 7.023 -7.881 1.00 12.20 H new ATOM 0 HG3 ARG A 7 9.202 7.456 -8.935 1.00 12.20 H new ATOM 0 HD2 ARG A 7 7.936 8.361 -7.025 1.00 32.14 H new ATOM 0 HD3 ARG A 7 9.187 7.842 -5.914 1.00 32.14 H new ATOM 0 HE ARG A 7 10.506 9.674 -6.526 1.00 60.24 H new ATOM 0 HH11 ARG A 7 7.814 9.252 -8.771 1.00 74.32 H new ATOM 0 HH12 ARG A 7 8.090 10.802 -9.573 1.00 74.32 H new ATOM 0 HH21 ARG A 7 10.852 11.663 -7.561 1.00 62.01 H new ATOM 0 HH22 ARG A 7 9.801 12.161 -8.891 1.00 62.01 H new ATOM 138 N LYS A 8 7.381 4.106 -9.822 1.00 14.21 N ATOM 139 CA LYS A 8 7.287 3.630 -11.197 1.00 31.02 C ATOM 140 C LYS A 8 5.986 4.092 -11.845 1.00 51.33 C ATOM 141 O LYS A 8 5.977 4.533 -12.995 1.00 42.10 O ATOM 142 CB LYS A 8 7.374 2.103 -11.236 1.00 61.44 C ATOM 143 CG LYS A 8 7.835 1.554 -12.576 1.00 13.12 C ATOM 144 CD LYS A 8 7.991 0.043 -12.536 1.00 1.34 C ATOM 145 CE LYS A 8 6.649 -0.660 -12.672 1.00 2.24 C ATOM 146 NZ LYS A 8 6.809 -2.127 -12.868 1.00 23.34 N ATOM 0 H LYS A 8 7.606 3.382 -9.140 1.00 14.21 H new ATOM 0 HA LYS A 8 8.121 4.050 -11.759 1.00 31.02 H new ATOM 0 HB2 LYS A 8 8.061 1.767 -10.459 1.00 61.44 H new ATOM 0 HB3 LYS A 8 6.395 1.685 -10.999 1.00 61.44 H new ATOM 0 HG2 LYS A 8 7.116 1.826 -13.348 1.00 13.12 H new ATOM 0 HG3 LYS A 8 8.786 2.012 -12.850 1.00 13.12 H new ATOM 0 HD2 LYS A 8 8.654 -0.277 -13.340 1.00 1.34 H new ATOM 0 HD3 LYS A 8 8.463 -0.250 -11.598 1.00 1.34 H new ATOM 0 HE2 LYS A 8 6.051 -0.476 -11.780 1.00 2.24 H new ATOM 0 HE3 LYS A 8 6.102 -0.238 -13.515 1.00 2.24 H new ATOM 0 HZ1 LYS A 8 5.872 -2.570 -12.956 1.00 23.34 H new ATOM 0 HZ2 LYS A 8 7.358 -2.304 -13.733 1.00 23.34 H new ATOM 0 HZ3 LYS A 8 7.308 -2.534 -12.052 1.00 23.34 H new ATOM 160 N ILE A 9 4.890 3.990 -11.101 1.00 2.23 N ATOM 161 CA ILE A 9 3.585 4.401 -11.603 1.00 71.41 C ATOM 162 C ILE A 9 3.555 5.896 -11.900 1.00 65.02 C ATOM 163 O ILE A 9 3.012 6.327 -12.917 1.00 14.52 O ATOM 164 CB ILE A 9 2.465 4.066 -10.600 1.00 70.33 C ATOM 165 CG1 ILE A 9 2.521 2.586 -10.215 1.00 42.00 C ATOM 166 CG2 ILE A 9 1.106 4.414 -11.188 1.00 52.43 C ATOM 167 CD1 ILE A 9 2.327 1.649 -11.386 1.00 74.14 C ATOM 0 H ILE A 9 4.880 3.626 -10.148 1.00 2.23 H new ATOM 0 HA ILE A 9 3.414 3.847 -12.526 1.00 71.41 H new ATOM 0 HB ILE A 9 2.614 4.662 -9.700 1.00 70.33 H new ATOM 0 HG12 ILE A 9 3.483 2.377 -9.748 1.00 42.00 H new ATOM 0 HG13 ILE A 9 1.754 2.384 -9.468 1.00 42.00 H new ATOM 0 HG21 ILE A 9 0.325 4.172 -10.467 1.00 52.43 H new ATOM 0 HG22 ILE A 9 1.071 5.479 -11.417 1.00 52.43 H new ATOM 0 HG23 ILE A 9 0.947 3.841 -12.102 1.00 52.43 H new ATOM 0 HD11 ILE A 9 2.379 0.617 -11.039 1.00 74.14 H new ATOM 0 HD12 ILE A 9 1.353 1.831 -11.840 1.00 74.14 H new ATOM 0 HD13 ILE A 9 3.109 1.823 -12.125 1.00 74.14 H new ATOM 179 N VAL A 10 4.146 6.683 -11.006 1.00 41.14 N ATOM 180 CA VAL A 10 4.191 8.131 -11.174 1.00 34.23 C ATOM 181 C VAL A 10 4.890 8.513 -12.474 1.00 31.55 C ATOM 182 O VAL A 10 4.358 9.283 -13.273 1.00 62.12 O ATOM 183 CB VAL A 10 4.914 8.810 -9.996 1.00 21.13 C ATOM 184 CG1 VAL A 10 4.858 10.324 -10.136 1.00 30.55 C ATOM 185 CG2 VAL A 10 4.310 8.366 -8.672 1.00 75.33 C ATOM 0 H VAL A 10 4.600 6.342 -10.159 1.00 41.14 H new ATOM 0 HA VAL A 10 3.158 8.478 -11.206 1.00 34.23 H new ATOM 0 HB VAL A 10 5.961 8.506 -10.011 1.00 21.13 H new ATOM 0 HG11 VAL A 10 5.374 10.787 -9.295 1.00 30.55 H new ATOM 0 HG12 VAL A 10 5.342 10.622 -11.066 1.00 30.55 H new ATOM 0 HG13 VAL A 10 3.818 10.650 -10.148 1.00 30.55 H new ATOM 0 HG21 VAL A 10 4.833 8.856 -7.851 1.00 75.33 H new ATOM 0 HG22 VAL A 10 3.255 8.638 -8.644 1.00 75.33 H new ATOM 0 HG23 VAL A 10 4.408 7.285 -8.572 1.00 75.33 H new ATOM 195 N ARG A 11 6.085 7.968 -12.678 1.00 52.11 N ATOM 196 CA ARG A 11 6.858 8.252 -13.881 1.00 51.11 C ATOM 197 C ARG A 11 6.032 7.981 -15.135 1.00 31.50 C ATOM 198 O ARG A 11 5.904 8.842 -16.004 1.00 74.03 O ATOM 199 CB ARG A 11 8.133 7.407 -13.905 1.00 2.53 C ATOM 200 CG ARG A 11 9.133 7.844 -14.963 1.00 60.42 C ATOM 201 CD ARG A 11 9.895 9.086 -14.531 1.00 5.31 C ATOM 202 NE ARG A 11 10.547 9.749 -15.658 1.00 33.50 N ATOM 203 CZ ARG A 11 11.023 10.988 -15.607 1.00 74.41 C ATOM 204 NH1 ARG A 11 10.921 11.695 -14.490 1.00 51.25 N ATOM 205 NH2 ARG A 11 11.602 11.521 -16.675 1.00 4.32 N ATOM 0 H ARG A 11 6.538 7.328 -12.026 1.00 52.11 H new ATOM 0 HA ARG A 11 7.130 9.307 -13.867 1.00 51.11 H new ATOM 0 HB2 ARG A 11 8.609 7.455 -12.926 1.00 2.53 H new ATOM 0 HB3 ARG A 11 7.865 6.365 -14.079 1.00 2.53 H new ATOM 0 HG2 ARG A 11 9.836 7.034 -15.157 1.00 60.42 H new ATOM 0 HG3 ARG A 11 8.610 8.044 -15.898 1.00 60.42 H new ATOM 0 HD2 ARG A 11 9.209 9.782 -14.048 1.00 5.31 H new ATOM 0 HD3 ARG A 11 10.645 8.811 -13.789 1.00 5.31 H new ATOM 0 HE ARG A 11 10.642 9.232 -16.532 1.00 33.50 H new ATOM 0 HH11 ARG A 11 10.476 11.288 -13.667 1.00 51.25 H new ATOM 0 HH12 ARG A 11 11.287 12.646 -14.453 1.00 51.25 H new ATOM 0 HH21 ARG A 11 11.682 10.979 -17.536 1.00 4.32 H new ATOM 0 HH22 ARG A 11 11.967 12.472 -16.636 1.00 4.32 H new ATOM 219 N ALA A 12 5.474 6.777 -15.221 1.00 4.11 N ATOM 220 CA ALA A 12 4.660 6.393 -16.367 1.00 30.40 C ATOM 221 C ALA A 12 3.462 7.322 -16.525 1.00 55.14 C ATOM 222 O ALA A 12 3.179 7.806 -17.622 1.00 73.03 O ATOM 223 CB ALA A 12 4.197 4.950 -16.225 1.00 54.40 C ATOM 0 H ALA A 12 5.571 6.052 -14.511 1.00 4.11 H new ATOM 0 HA ALA A 12 5.274 6.480 -17.263 1.00 30.40 H new ATOM 0 HB1 ALA A 12 3.590 4.676 -17.088 1.00 54.40 H new ATOM 0 HB2 ALA A 12 5.065 4.293 -16.169 1.00 54.40 H new ATOM 0 HB3 ALA A 12 3.604 4.846 -15.316 1.00 54.40 H new ATOM 229 N LEU A 13 2.760 7.568 -15.425 1.00 33.45 N ATOM 230 CA LEU A 13 1.590 8.439 -15.441 1.00 42.43 C ATOM 231 C LEU A 13 1.946 9.817 -15.990 1.00 0.52 C ATOM 232 O LEU A 13 1.669 10.126 -17.149 1.00 15.35 O ATOM 233 CB LEU A 13 1.009 8.573 -14.033 1.00 10.14 C ATOM 234 CG LEU A 13 -0.039 7.532 -13.637 1.00 64.22 C ATOM 235 CD1 LEU A 13 -0.265 7.547 -12.133 1.00 52.04 C ATOM 236 CD2 LEU A 13 -1.344 7.781 -14.378 1.00 14.23 C ATOM 0 H LEU A 13 2.981 7.176 -14.509 1.00 33.45 H new ATOM 0 HA LEU A 13 0.842 7.989 -16.094 1.00 42.43 H new ATOM 0 HB2 LEU A 13 1.829 8.524 -13.317 1.00 10.14 H new ATOM 0 HB3 LEU A 13 0.562 9.563 -13.939 1.00 10.14 H new ATOM 0 HG LEU A 13 0.332 6.546 -13.917 1.00 64.22 H new ATOM 0 HD11 LEU A 13 -1.014 6.800 -11.870 1.00 52.04 H new ATOM 0 HD12 LEU A 13 0.670 7.319 -11.622 1.00 52.04 H new ATOM 0 HD13 LEU A 13 -0.614 8.533 -11.827 1.00 52.04 H new ATOM 0 HD21 LEU A 13 -2.078 7.031 -14.084 1.00 14.23 H new ATOM 0 HD22 LEU A 13 -1.720 8.774 -14.130 1.00 14.23 H new ATOM 0 HD23 LEU A 13 -1.170 7.717 -15.452 1.00 14.23 H new TER 248 LEU A 13