1l9j C 3.25 BS01 HEM C 1 C15 C18 H19 P38 R46 A48 G49 Y57 G58 M61 W71 F76 Y79 K99 M100 T101 F102 C15 C18 H19 P38 R46 A48 G49 Y57 G58 M61 W71 F76 Y79 K99 M100 T101 F102 ? 0009055,0015979,0020037,0042597,0046872 P0C0X8 12051924 1009 QEGDPEAGAKAFNQCQTCHVIVDDSGTTIAGRNAKTGPNLYGVVGRTAGTQADFKGYGEGMKEAGAKGLAWDEEHFVQYVQDPTKFLKEYTGDAKAKGKMTFKLKKEADAHNIWAYLQQVAVRP 1l9j D 3.25 BS01 HEM D 1 C15 C18 H19 T36 P38 R46 A48 G49 Y57 G58 M61 W71 F76 Y79 M100 F102 C15 C18 H19 T36 P38 R46 A48 G49 Y57 G58 M61 W71 F76 Y79 M100 F102 ? 0009055,0015979,0020037,0042597,0046872 P0C0X8 12051924 2009 QEGDPEAGAKAFNQCQTCHVIVDDSGTTIAGRNAKTGPNLYGVVGRTAGTQADFKGYGEGMKEAGAKGLAWDEEHFVQYVQDPTKFLKEYTGDAKAKGKMTFKLKKEADAHNIWAYLQQVAVRP 1l9j L 3.25 BS01 BCL L 1 F97 A124 V157 T160 Y162 F167 H168 H173 I177 F180 S244 A245 M248 F97 A124 V157 T160 Y162 F167 H168 H173 I177 F180 S244 A245 M248 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 1002 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j L 3.25 BS02 BCL L 2 L131 F146 W151 H153 L154 L131 F146 W151 H153 L154 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 1004 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j L 3.25 BS03 BPH L 1 F181 L185 L219 F181 L185 L219 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 1005 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j L 3.25 BS04 FE2 M 1 H190 H230 H190 H230 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 1007 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j L 3.25 BS05 BCL M 1 H168 M174 I177 S178 F181 T182 H168 M174 I177 S178 F181 T182 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 1001 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j L 3.25 BS06 BPH M 1 A93 W100 E104 I117 F121 Y148 H153 V241 A93 W100 E104 I117 F121 Y148 H153 V241 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 1006 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j M 3.25 BS01 BCL L 2 I206 A207 Y210 I172 A173 Y176 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 1004 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j M 3.25 BS02 BPH L 1 A125 W129 A149 F150 A153 A273 T277 A91 W95 A115 F116 A119 A239 T243 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 1005 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j M 3.25 BS03 FE2 M 1 H219 E234 H266 H185 E200 H232 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 1007 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j M 3.25 BS04 BCL M 1 H182 L183 H148 L149 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 1001 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j M 3.25 BS05 BCL M 2 W66 A153 L156 T186 N187 S190 L196 F197 H202 S205 I206 L209 Y210 G280 G281 I284 W32 A119 L122 T152 N153 S156 L162 F163 H168 S171 I172 L175 Y176 G246 G247 I250 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 1003 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j M 3.25 BS06 BPH M 1 Y210 L214 M218 W252 Y176 L180 M184 W218 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 1006 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j M 3.25 BS07 U10 M 1 M218 H219 T222 A249 W252 M256 N259 A260 T261 M262 I265 W268 M184 H185 T188 A215 W218 M222 N225 A226 T227 M228 I231 W234 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 1008 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j R 3.25 BS01 BCL R 1 F97 A124 I125 Y128 V157 Y162 F167 H168 H173 I177 F180 F181 S244 A245 M248 F97 A124 I125 Y128 V157 Y162 F167 H168 H173 I177 F180 F181 S244 A245 M248 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 2002 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j R 3.25 BS02 BCL R 2 I46 Y128 L131 F146 I150 W151 H153 L154 I46 Y128 L131 F146 I150 W151 H153 L154 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 2004 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j R 3.25 BS03 BPH R 1 F181 L185 L189 F181 L185 L189 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 2005 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j R 3.25 BS04 FE2 S 1 H190 H230 H190 H230 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 2007 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j R 3.25 BS05 BCL S 1 H168 M174 I177 S178 T182 H168 M174 I177 S178 T182 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 2001 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j R 3.25 BS06 BPH S 1 A93 A96 W100 E104 F121 Y148 V241 A93 A96 W100 E104 F121 Y148 V241 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y8 12051924 2006 ALLSFERKYRVPGGTLVGGNLFDFWVGPFYVGFFGVATFFFAALGIILIAWSAVLQGTWNPQLISVYPPALEYGLGGAPLAKGGLWQIITICATGAFVSWALREVEICRKLGIGYHIPFAFAFAILAYLTLVLFRPVMMGAWGYAFPYGIWTHLDWVSNTGYTYGNFHYNPAHMIAISFFFTNALALALHGALVLSAANPEKGKEMRTPDHEDTFFRDLVGYSIGTLGIHRLGLLLSLSAVFFSALCMIITGTIWFDQWVDWWQWWVKLPWWANIPGGING 1l9j S 3.25 BS01 BCL R 2 I206 A207 Y210 I172 A173 Y176 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 2004 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j S 3.25 BS02 BPH R 1 S59 L60 G63 A125 W129 A149 F150 A153 A273 S25 L26 G29 A91 W95 A115 F116 A119 A239 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 2005 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j S 3.25 BS03 FE2 S 1 H219 E234 H266 H185 E200 H232 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 2007 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j S 3.25 BS04 BCL S 1 H182 L183 H148 L149 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 2001 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j S 3.25 BS05 BCL S 2 W66 L156 W157 T186 N187 S190 L196 F197 H202 S205 I206 L209 Y210 G280 I284 W32 L122 W123 T152 N153 S156 L162 F163 H168 S171 I172 L175 Y176 G246 I250 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 2003 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j S 3.25 BS06 BPH S 1 Y210 L214 M218 W252 Y176 L180 M184 W218 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 2006 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH 1l9j S 3.25 BS07 U10 S 1 M218 H219 T222 W252 M256 F258 N259 A260 T261 M262 I265 W268 M184 H185 T188 W218 M222 F224 N225 A226 T227 M228 I231 W234 ? 0009772,0015979,0016020,0019684,0030077,0042314,0042717,0045156,0046872 P0C0Y9 12051924 2008 FSTLLGWFGNAQLGPIYLGSLGVLSLFSGLMWFFTIGIWFWYQAGWNPAVFLRDLFFFSLEPPAPEYGLSFAAPLKEGGLWLIASFFMFVAVWSWWGRTYLRAQALGMGKHTAWAFLSAIWLWMVLGFIRPILMGSWSEAVPYGIFSHLDWTNNFSLVHGNLFYNPFHGLSIAFLYGSALLFAMHGATILAVSRFGGERELEQIADRGTAAERAALFWRWTMGFNATMEGIHRWAIWMAVLVTLTGGIGILLSGTVVDNWYVWGQNH