1s2g A 2.1 BS01 3D1 A 1 G13 S14 Y17 P44 F45 T71 D75 D95 G97 E101 G13 S14 Y17 P44 F45 T69 D73 D93 G95 E99 Y11 D75 D95 E101 Y11 D73 D93 E99 2.4.2.6 0016757,0050144 Q8RLY5 14992575 1168 MKAVVPTGKIYLGSPFYSDAQRERAAKAKELLAKNPSIAHVFFPFDGFTDPDEKPEIGGIRSMVWRDATYQNDLTGISNATCGVFLYDMDQLDDGSAFEIGFMRAMHKPVILVPFTEHPEKEKKMNLMIAQGVTTIIDGNTEFEKLADYNFNECPSNPVRGYGIY 1s2g B 2.1 BS01 3D1 B 1 G13 S14 Y17 P44 F45 T71 D75 D95 G97 E101 G13 S14 Y17 P44 F45 T71 D75 D95 G97 E101 Y11 D75 D95 E101 Y11 D75 D95 E101 2.4.2.6 0016757,0050144 Q8RLY5 14992575 1169 MKAVVPTGKIYLGSPFYSDAQRERAAKAKELLAKNPSIAHVFFPFDDGFTDPDEKNPEIGGIRSMVWRDATYQNDLTGISNATCGVFLYDMDQLDDGSAFEIGFMRAMHKPVILVPFTEHPEKEKKMNLMIAQGVTTIIDGNTEFEKLADYNFNECPSNPVRGYGIY 1s2g C 2.1 BS01 3D1 C 1 G13 S14 P44 F45 T71 D75 D95 G97 E101 G13 S14 P44 F45 T71 D75 D95 G97 E101 Y11 D75 D95 E101 Y11 D75 D95 E101 2.4.2.6 0016757,0050144 Q8RLY5 14992575 1170 MKAVVPTGKIYLGSPFYSDAQRERAAKAKELLAKNPSIAHVFFPFDDGFTDPDEKNPEIGGIRSMVWRDATYQNDLTGISNATCGVFLYDMDQLDDGSAFEIGFMRAMHKPVILVPFTEHPEKEKKMNLMIAQGVTTIIDGNTEFEKLADYNFNECPSNPVRGYGIY 2c5h A 2.7 BS02 3D1 A 1 D16 W50 Y77 P78 T155 F156 S158 D9 W43 Y70 P71 T148 F149 S151 2.5.1.63 0016740,0033846 Q70GK9 500 RPIIAFMSDLGTTDDSVAQCKGLMYSICPDVTVVDVCHSMTPWDVEEGARYIVDLPRFFPEGTVFATTTYPATGTTTRSVAVRIKQAAKGGARGQWAGSGAGFERAEGSYIYIAPNNGLLTTVLEEHGYLEAYEVTSPKVIPEQPEPTFYSREMVAIPSAHLAAGFPLSEVGRPLEDHEIVRFNRPAVEQDGEALVGVVSAIDHPFGNVWTNIHRTDLEKAGIGYGARLRLTLDGVLPFEAPLTPTFADAGEIGNIAIYLNSRGYLSIARNAASLAYPYHLKEGMSARVEA 2c5h A 2.7 BS04 3D1 B 1 F213 N215 F254 R277 A279 F206 N208 F247 R270 A272 2.5.1.63 0016740,0033846 Q70GK9 500 RPIIAFMSDLGTTDDSVAQCKGLMYSICPDVTVVDVCHSMTPWDVEEGARYIVDLPRFFPEGTVFATTTYPATGTTTRSVAVRIKQAAKGGARGQWAGSGAGFERAEGSYIYIAPNNGLLTTVLEEHGYLEAYEVTSPKVIPEQPEPTFYSREMVAIPSAHLAAGFPLSEVGRPLEDHEIVRFNRPAVEQDGEALVGVVSAIDHPFGNVWTNIHRTDLEKAGIGYGARLRLTLDGVLPFEAPLTPTFADAGEIGNIAIYLNSRGYLSIARNAASLAYPYHLKEGMSARVEA 2c5h B 2.7 BS01 3D1 A 1 F213 N215 F254 R277 A279 F206 N208 F247 R270 A272 2.5.1.63 0016740,0033846 Q70GK9 500 RPIIAFMSDLGTTDDSVAQCKGLMYSICPDVTVVDVCHSMTPWDVEEGARYIVDLPRFFPEGTVFATTTYPATGTTTRSVAVRIKQAAKGGARGQWAGSGAGFERAEGSYIYIAPNNGLLTTVLEEHGYLEAYEVTSPKVIPEQPEPTFYSREMVAIPSAHLAAGFPLSEVGRPLEDHEIVRFNRPAVEQDGEALVGVVSAIDHPFGNVWTNIHRTDLEKAGIGYGARLRLTLDGVLPFEAPLTPTFADAGEIGNIAIYLNSRGYLSIARNAASLAYPYHLKEGMSARVEA 2c5h B 2.7 BS03 3D1 C 1 D16 W50 Y77 T155 F156 S158 D9 W43 Y70 T148 F149 S151 2.5.1.63 0016740,0033846 Q70GK9 500 RPIIAFMSDLGTTDDSVAQCKGLMYSICPDVTVVDVCHSMTPWDVEEGARYIVDLPRFFPEGTVFATTTYPATGTTTRSVAVRIKQAAKGGARGQWAGSGAGFERAEGSYIYIAPNNGLLTTVLEEHGYLEAYEVTSPKVIPEQPEPTFYSREMVAIPSAHLAAGFPLSEVGRPLEDHEIVRFNRPAVEQDGEALVGVVSAIDHPFGNVWTNIHRTDLEKAGIGYGARLRLTLDGVLPFEAPLTPTFADAGEIGNIAIYLNSRGYLSIARNAASLAYPYHLKEGMSARVEA 2c5h C 2.7 BS02 3D1 B 1 D16 W50 Y77 P78 T155 F156 S158 D9 W43 Y70 P71 T148 F149 S151 2.5.1.63 0016740,0033846 Q70GK9 500 RPIIAFMSDLGTTDDSVAQCKGLMYSICPDVTVVDVCHSMTPWDVEEGARYIVDLPRFFPEGTVFATTTYPATGTTTRSVAVRIKQAAKGGARGQWAGSGAGFERAEGSYIYIAPNNGLLTTVLEEHGYLEAYEVTSPKVIPEQPEPTFYSREMVAIPSAHLAAGFPLSEVGRPLEDHEIVRFNRPAVEQDGEALVGVVSAIDHPFGNVWTNIHRTDLEKAGIGYGARLRLTLDGVLPFEAPLTPTFADAGEIGNIAIYLNSRGYLSIARNAASLAYPYHLKEGMSARVEA 2c5h C 2.7 BS03 3D1 C 1 F213 N215 F254 R277 A279 F206 N208 F247 R270 A272 2.5.1.63 0016740,0033846 Q70GK9 500 RPIIAFMSDLGTTDDSVAQCKGLMYSICPDVTVVDVCHSMTPWDVEEGARYIVDLPRFFPEGTVFATTTYPATGTTTRSVAVRIKQAAKGGARGQWAGSGAGFERAEGSYIYIAPNNGLLTTVLEEHGYLEAYEVTSPKVIPEQPEPTFYSREMVAIPSAHLAAGFPLSEVGRPLEDHEIVRFNRPAVEQDGEALVGVVSAIDHPFGNVWTNIHRTDLEKAGIGYGARLRLTLDGVLPFEAPLTPTFADAGEIGNIAIYLNSRGYLSIARNAASLAYPYHLKEGMSARVEA 2z3m A 2.7 BS01 3D1 A 1 W49 Q188 W48 Q187 2.3.2.6 0005737,0008914,0016746,0016755,0030163 P0A8P1 17891155 301 RLVQLSRHSIAFPSPEGALREPNGLLALGGDLSPARLLMAYQRGIFPWFSPGDPILWWSPDPRAVLWPESLHISRSMKRFHKRSPYRVTMNYAFGQVIEGCASDREEGTWITRGVVEAYHRLHELGHAHSIEVWREDELVGGMYGVAQGTLFCGESMFSRMENASKTALLVFCEEFIGHGGKLIDCQVLNDHTASLGACEIPRRDYLNYLNQMRLGRLPNNFWVPRCLFSP 2z3m B 2.7 BS01 3D1 B 1 W49 Q188 H193 W48 Q187 H192 2.3.2.6 0005737,0008914,0016746,0016755,0030163 P0A8P1 17891155 401 RLVQLSRHSIAFPSPEGALREPNGLLALGGDLSPARLLMAYQRGIFPWFSPGDPILWWSPDPRAVLWPESLHISRSMKRFHKRSPYRVTMNYAFGQVIEGCASDREEGTWITRGVVEAYHRLHELGHAHSIEVWREDELVGGMYGVAQGTLFCGESMFSRMENASKTALLVFCEEFIGHGGKLIDCQVLNDHTASLGACEIPRRDYLNYLNQMRLGRLPNNFWVPRCLFSP 2zi3 A 2.3 BS02 3D1 A 1 I30 E53 W58 L82 Y86 F96 Q97 D133 F137 E197 I11 E34 W39 L63 Y67 F77 Q78 D114 F118 E178 E53 R128 E34 R109 2.7.1.113,2.7.1.74,2.7.1.76 0004136,0004137,0004138,0005515,0005524,0005634,0005654,0005737,0005739,0005829,0006139,0006220,0008144,0009224,0016301,0016310,0019136,0042803,0043771,0106383,1901135,1901293 P27707 18377927 302 RIKKISIEGNIAAGKSTFVNILKQLSEDWEVVPEPVARWSNVQSTQDEFEELTMSQKNGGNVLQMMYEKPERWSFTFQTYACLSRIRAQLASLNGKLKDAEKPVLFFERSVYSDRYIFASNLYESESMNETEWTIYQDWHDWMNNQFGQSLELDGIIYLQATPETCLHRIYLRGRNEEQGIPLEYLEKLHYKHESWLLHRTLKTNFDYLQEVPILTLDVNEDFKDKYASLVEKVKEFLSTL 2zi3 B 2.3 BS02 3D1 B 1 I30 E53 W58 L82 Y86 F96 Q97 R128 D133 F137 E197 I10 E33 W38 L44 Y48 F58 Q59 R89 D94 F98 E158 E53 R128 E33 R89 2.7.1.113,2.7.1.74,2.7.1.76 0004136,0004137,0004138,0005515,0005524,0005634,0005654,0005737,0005739,0005829,0006139,0006220,0008144,0009224,0016301,0016310,0019136,0042803,0043771,0106383,1901135,1901293 P27707 18377927 302 IKKISIEGNIAAGKSTFVNILKQLSEDWEVVPEPVARWSNVNVLQMMYEKPERWSFTFQTYACLSRIRAQLASLNGKLDAEKPVLFFERSVYSDRYIFASNLYESESMNETEWTIYQDWHDWMNNQFGQSLELDGIIYLQATPETCLHRIYLRGRNEEQGIPLEYLEKLHYKHESWLLHRTLKTNFDYLQEVPILTLDVNEDFKDKYASLVEKVKEFLSTL 2zi6 A 1.77 BS02 3D1 A 1 E1053 V1055 Y1086 F1096 Q1097 D1133 F1137 E34 V36 Y48 F58 Q59 D90 F94 2.7.1.113,2.7.1.74,2.7.1.76 0004136,0004137,0004138,0005515,0005524,0005634,0005654,0005737,0005739,0005829,0006139,0006220,0008144,0009224,0016301,0016310,0019136,0042803,0043771,0106383,1901135,1901293 P27707 18377927 1302 RIKKISIEGNIAAGKSTFVNILKQLSEDWEVVPEPVARWGGNVLQMMYEKPERWSFTFQTYACLSRIRAQLASLNAEKPVLFFERSVYSDRYIFASNLYESESMNETEWTIYQDWHDWMNNQFGQSLELDGIIYLQATPETCLHRIYLRGRNEEQGIPLEYLEKLHYKHESWLLHRTLKTNFDYLQEVPILTLDVNEDFKDKYESLVEKVKEFLSTL 2zi6 B 1.77 BS02 3D1 B 1 E2053 V2055 L2082 Y2086 F2096 Q2097 F2137 E34 V36 L53 Y57 F67 Q68 F105 E2053 R2128 E34 R96 2.7.1.113,2.7.1.74,2.7.1.76 0004136,0004137,0004138,0005515,0005524,0005634,0005654,0005737,0005739,0005829,0006139,0006220,0008144,0009224,0016301,0016310,0019136,0042803,0043771,0106383,1901135,1901293 P27707 18377927 2302 RIKKISIEGNIAAGKSTFVNILKQLSEDWEVVPEPVARWSNVTMSQKNGGNVLQMMYEKPERWSFTFQTYACLSRIRAQLASLNGKLEKPVLFFERSVYSDRYIFASNLYESESMNETEWTIYQDWHDWMNNQSLELDGIIYLQATPETCLHRIYLRGRNEEQGIPLEYLEKLHYKHESWLLHRTLKTNFDYLQEVPILTLDVNEDFKDKYESLVEKVKEFLSTL 2zi6 C 1.77 BS02 3D1 C 1 I3030 E3053 V3055 Y3086 Q3097 D3133 F3137 I11 E34 V36 Y51 Q62 D92 F96 E3053 R3128 E34 R87 2.7.1.113,2.7.1.74,2.7.1.76 0004136,0004137,0004138,0005515,0005524,0005634,0005654,0005737,0005739,0005829,0006139,0006220,0008144,0009224,0016301,0016310,0019136,0042803,0043771,0106383,1901135,1901293 P27707 18377927 3302 RIKKISIEGNIAAGKSTFVNILKQLSEDWEVVPEPVARWSKNGGNVLQMMYEKPERWSFTFQTYACLSRIRAQLASLNEKPVLFFERSVYSDRYIFASNLYESESMNETEWTIYQDWHDWMNNQFLELDGIIYLQATPETCLHRIYLRGRNEEQGIPLEYLEKLHYKHESWLLHRTLKTNFDYLQEVPILTLDVNEDFKDKYESLVEKVKEFLSTL 2zi6 D 1.77 BS02 3D1 D 1 I4030 E4053 F4096 Q4097 D4133 F4137 I11 E34 F59 Q60 D93 F97 E4053 R4128 E34 R88 2.7.1.113,2.7.1.74,2.7.1.76 0004136,0004137,0004138,0005515,0005524,0005634,0005654,0005737,0005739,0005829,0006139,0006220,0008144,0009224,0016301,0016310,0019136,0042803,0043771,0106383,1901135,1901293 P27707 18377927 4302 RIKKISIEGNIAAGKSTFVNILKQLSEDWEVVPEPVARWNGGNVLQMMYEKPERWSFTFQTYACLSRIRAQLASLNGKLEKPVLFFERSVYSDRYIFASNLYESESMNETEWTIYQDWHDWMNNQFGLELDGIIYLQATPETCLHRIYLRGRNEEQGIPLEYLEKLHYKHESWLLHRTLKTNFDYLQEVPILTLDVNEDFKDKYESLVEKVKEFLSTL 3iar A 1.52 BS01 3D1 A 1 H17 D19 L62 F65 M155 G184 H214 E217 D295 D296 H13 D15 L58 F61 M151 G180 H210 E213 D291 D292 H15 H17 H214 E217 H238 D295 H11 H13 H210 E213 H234 D291 3.5.4.4 0000255,0001666,0001701,0001829,0001889,0001890,0002314,0002467,0002636,0002686,0002901,0002906,0004000,0005515,0005737,0005764,0005829,0005886,0006154,0006157,0006196,0006805,0006915,0006939,0007155,0008270,0009117,0009168,0009897,0009986,0010035,0010460,0014074,0016020,0016787,0019239,0019722,0030217,0030324,0030890,0031410,0032261,0032263,0033077,0033089,0033632,0042100,0042110,0043066,0043084,0043101,0043103,0043605,0044209,0045580,0045582,0045987,0046059,0046061,0046085,0046101,0046103,0046111,0046632,0046638,0046872,0046936,0048286,0048541,0048566,0050728,0050850,0050852,0050862,0050870,0050900,0060169,0060205,0060407,0070161,0070242,0070244,0070254,0070256,0110148 P00813 501 PAFDKPKVELHVHLDGSIKPETILYYGRRRGIALPANTAEGLLNVIGMDKPLTLPDFLAKFDYYMPAIAGCREAIKRIAYEFVEMKAKEGVVYVEVRYSPHLLANSKVEPIPWNQAEGDLTPDEVVALVGQGLQEGERDFGVKARSILCCMRHQPNWSPKVVELCKKYQQQTVVAIDLAGDETIPGSSLLPGHVQAYQEAVKSGIHRTVHAGEVGSAEVVKEAVDILKTERLGHGYHTLEDQALYNRLRQENMHFEICPWSSYLTGAWKPDTEHAVIRLKNDQANYSLNTDDPLIFKSTLDTDYQMTKRDMGFTEEEFKRLNINAAKSSFLPEDEKRELLDLLYKAYGMPPSASAGQNLA 3si8 A 2.15 BS04 3D1 A 1 S257 K293 N294 W297 S252 K288 N289 W292 2.7.7.7 0003684,0006281 Q9Y253 20577208 438 PHMATGQDRVVALVDMDCFFVQVEQRQNPHLRNKPCAVVQYKSWKGGGIIAVSYEARAFGVTRSMWADDAKKLCPDLLLAQVRESRGKANLTKYREASVEVMEIMSRFAVIERASIDEAYVDLTSAVQERLQKLQGQPISADLLPSTYIEGLPQGVQKEGMRKQGLFQWLDSLQIDNLTSPDLQLTVGAVIVEEMRAAIERETGFQCSAGISHNKVLAKLACGLNKPNRQTLVSHGSVPQLFSQMPIRKIRSLGGKLGASVIEILGIEYMGELTQFTESQLQSHFGEKNGSWLYAMCRGIEHDPVKPRQLPKTIGCSKNFPGKTALATREQVQWWLLQLAQELEERLTKDRNDNDRVATQLVVSIRVQGDKRLSSLRRCCALTRYDAHKMSHDAFTVIKNCNIQTEWSPPLTMLFLCATKFS 4q7f A 1.98 BS03 3D1 A 1 H94 W154 F370 N372 F416 Y461 H93 W153 F369 N371 F415 Y460 N93 H94 N97 N92 H93 N96 ? 0000166,0008252,0009166,0016787,0016788,0030288,0046872 Q2G1L5 603 SNIAFYVVSDVHGYIFPTDFTSRNQYQPMGLLLANHVIEQDRRQYDQSFKIDNGDFLQGSPFCNYLIAHSGSSQPLVDFYNRMAFDFGTLGNHEFNYGLPYLKDTLRRLNYPVLCANIYENDSTLTDNGVKYFQVGDQTVGVIGLTTQFIPHWEQPEHIQSLTFHSAFEILQQYLPEMKRHADIIVVCYHGGFEKDLESGTPTEVLTGENEGYAMLEAFSKDIDIFITGHQHRQIAERFKQTAVIQPGTRGTTVGRVVLSTDEYENLSVESCELLPVIDDSTFTIDEDDQHLRKQLEDWLDYEITTLPYDMTINHAFEARVAPHPFTNFMNYALLEKSDADVACTALFDSASGFKQVVTMRDVINNYPFPNTFKVLAVSGAKLKEAIERSAEYFDVKNDEVSVSADFLEPKPQHFNYDIYGGVSYTIHVGRPKGQRVSNMMIQGHAVDLKQTYTICVNNYRAVGGGQYDMYIDAPVVKDIQVEGAQLLIDFLSNNNLMRIPQVVDFKVEK 5m67 C 1.54 BS03 3D1 C 1 L57 H58 T60 Q62 D135 T198 H342 H392 M397 L52 H53 T55 Q57 D130 T193 H337 H387 M392 H58 S81 S86 D135 E197 N222 K227 D231 N232 C236 H342 H392 S400 Q404 H53 S76 S81 D130 E192 N217 K222 D226 N227 C231 H337 H387 S395 Q399 3.13.2.1 0004013,0005737,0005829,0006730,0016787,0033353,0071269 A0A087WNH6 28512574 503 GFTDYIVKDIALADFGRKEISLAETEMPGLMATREEYGPKQPLKGARIAGSLHMTIQTAVLIETLAALGADIRWVSCNIYSTQDHAAAAIAAAGIPVFAVKGETLTEYWDYTAKLFDWHGGGTPNMILDDGGDATMLVHAGYRAEQGDTAFLDKPGSEEEEIFYALVKRLLKEKPKGWFAEIAKNIKGVSEETTTGVHRLYEMANKGTLLFPAINVNDSVTKSKFDNLYGCRESLVDGIRRGTDVMLSGKVAMVAGFGDVGKGSAASLRQAGCRVMVSEVDPICALQAAMEGYEVVTMEDAAPRADIFVTATGNKDIITIEHMRAMKDRAIVCNIGHFDNEIQIASLRNLKWTNIKPQVDEIEFPDKHRIIMLSEGRLVNLGNAMGHPSFVMSASFTNQTLAQIELFANNKDSKYAKKVYVLPKTLDEKVARLHLAKIGVKLTELRKDQADYIGVKQEGPYKSDHYRY 5m67 D 1.54 BS04 3D1 D 1 H58 T60 Q62 D135 T198 H342 L386 H392 M397 H55 T57 Q59 D132 T195 H339 L383 H389 M394 H58 S81 S86 D135 E197 N222 K227 D231 N232 C236 H342 H392 S400 Q404 H55 S78 S83 D132 E194 N219 K224 D228 N229 C233 H339 H389 S397 Q401 3.13.2.1 0004013,0005737,0005829,0006730,0016787,0033353,0071269 A0A087WNH6 28512574 503 KPGFTDYIVKDIALADFGRKEISLAETEMPGLMATREEYGPKQPLKGARIAGSLHMTIQTAVLIETLAALGADIRWVSCNIYSTQDHAAAAIAAAGIPVFAVKGETLTEYWDYTAKLFDWHGGGTPNMILDDGGDATMLVHAGYRAEQGDTAFLDKPGSEEEEIFYALVKRLLKEKPKGWFAEIAKNIKGVSEETTTGVHRLYEMANKGTLLFPAINVNDSVTKSKFDNLYGCRESLVDGIRRGTDVMLSGKVAMVAGFGDVGKGSAASLRQAGCRVMVSEVDPICALQAAMEGYEVVTMEDAAPRADIFVTATGNKDIITIEHMRAMKDRAIVCNIGHFDNEIQIASLRNLKWTNIKPQVDEIEFPDKHRIIMLSEGRLVNLGNAMGHPSFVMSASFTNQTLAQIELFANNKDSKYAKKVYVLPKTLDEKVARLHLAKIGVKLTELRKDQADYIGVKQEGPYKSDHYRY 6zpa A 0.860003 BS01 3D1 A 1 R19 W20 I22 V23 D75 A76 T78 P79 V139 L143 R17 W18 I20 V21 D73 A74 T76 P77 V137 L141 33893297 201 LQITETYERLRASHISRWGIVQTTYPQNIAEHMWRVWLLCRDWGAAAGMPQHTVRQACEFALVHDLAEIRTGDAPTPHKTPELKELLAGIEAQIVPEVAELEATMAPEARELWKFCDTAEAVLFLKVNGLGAHAYDVQHLLMEQMKRRLMDSVLDVEVQDELMFQFERTIKKT 6zpb A 1.72097 BS01 3D1 A 1 R19 W20 I22 V23 D75 P77 T78 P79 V139 L143 R17 W18 I20 V21 D73 P75 T76 P77 V137 L141 33893297 201 LQITETYERLRASHISRWGIVQTTYPQNIAEHMWRVWLLCRDWGAAAGMPQHTVRQACEFALVHDLAEIRTGDAPTPHKTPELKELLAGIEAQIVPEVAELEATMAPEARELWKFCDTAEAVLFLKVNGLGAHAYDVQHLLMEQMKRRLMDSVLDVEVQDELMFQFERTIKKT 8efg A 1.5 BS04 3D1 A 1 T79 R80 R119 F122 T78 R79 R118 F121 3.1.21.- 0004518,0005515,0005634,0005654,0005739,0006259,0008296,0016788,0046872 Q6P1N9 36881763 310 SRFKFIDIGINLTDPMFRGIYRGVQKHQDDLQDVIGRAVEIGVKKFMITGGNLQDSKDALHLAQTNGMFFSTVGCHPTRCGEFEKNNPDLYLKELLNLAENNKGKVVAIGECGLDFDRLQFCPKDTQLKYFEKQFELSEQTKLPMFLHCRNSHAEFLDIMKRNRDRCVGGVVHSFDGTKEAAAALIDLDLYIGFNGCSLKTEANLEVLKSIPSEKLMIETDAPWCGVKSTHAGSKYIRTAFPTKKKWESGHCLKDRNEPCHIIQILEIMSAVRDEDPLELANTLYNNTIKVFFPG