
Apart from single amino acid frequencies one can also calculate so called amino acid dipeptide frequency. 
There is 400 possibilites (441 if we consider Xaa as additional 21st amino acid representing all non-standard or unknown amino acids).
Thus, if the dipeptides would be present randomly in proteins each amino acid dipeptide should be present with 0.25% frequency. As it is not the case in the nature, for better visablity all more than expected dipepetides are marked by red, and those which are underrepresented are marked by blue in the table.
All values are presented as per milles (‰), therefore need to be multiplied by 10-3.
For more information see sequence space article on Wikipedia.
| Ala | Cys | Asp | Glu | Phe | Gly | His | Ile | Lys | Leu | Met | Asn | Pro | Gln | Arg | Ser | Thr | Val | Trp | Tyr | Xaa | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ala | 0.906AlaAla: 0.906 ± 0.248  | 0.205AlaCys: 0.205 ± 0.081  | 0.409AlaAsp: 0.409 ± 0.134  | 0.526AlaGlu: 0.526 ± 0.203  | 0.672AlaPhe: 0.672 ± 0.12  | 1.082AlaGly: 1.082 ± 0.229  | 0.205AlaHis: 0.205 ± 0.067  | 1.549AlaIle: 1.549 ± 0.309  | 1.198AlaLys: 1.198 ± 0.221  | 1.549AlaLeu: 1.549 ± 0.242  | 0.234AlaMet: 0.234 ± 0.077  | 0.935AlaAsn: 0.935 ± 0.19  | 0.409AlaPro: 0.409 ± 0.102  | 0.322AlaGln: 0.322 ± 0.1  | 0.409AlaArg: 0.409 ± 0.104  | 0.965AlaSer: 0.965 ± 0.218  | 0.702AlaThr: 0.702 ± 0.229  | 0.906AlaVal: 0.906 ± 0.18  | 0.029AlaTrp: 0.029 ± 0.031  | 0.438AlaTyr: 0.438 ± 0.116  | 0.0AlaXaa: 0.0 ± 0.0  | 
| Cys | 0.263CysAla: 0.263 ± 0.129  | 0.205CysCys: 0.205 ± 0.078  | 0.614CysAsp: 0.614 ± 0.113  | 0.643CysGlu: 0.643 ± 0.159  | 1.374CysPhe: 1.374 ± 0.256  | 0.818CysGly: 0.818 ± 0.154  | 0.351CysHis: 0.351 ± 0.124  | 1.257CysIle: 1.257 ± 0.17  | 1.725CysLys: 1.725 ± 0.191  | 1.608CysLeu: 1.608 ± 0.202  | 0.117CysMet: 0.117 ± 0.06  | 0.935CysAsn: 0.935 ± 0.167  | 0.322CysPro: 0.322 ± 0.108  | 0.234CysGln: 0.234 ± 0.086  | 0.322CysArg: 0.322 ± 0.084  | 0.965CysSer: 0.965 ± 0.152  | 0.38CysThr: 0.38 ± 0.105  | 0.643CysVal: 0.643 ± 0.14  | 0.146CysTrp: 0.146 ± 0.063  | 0.848CysTyr: 0.848 ± 0.153  | 0.0CysXaa: 0.0 ± 0.0  | 
| Asp | 0.731AspAla: 0.731 ± 0.167  | 0.497AspCys: 0.497 ± 0.124  | 1.169AspAsp: 1.169 ± 0.249  | 1.345AspGlu: 1.345 ± 0.279  | 3.917AspPhe: 3.917 ± 0.356  | 0.818AspGly: 0.818 ± 0.186  | 0.322AspHis: 0.322 ± 0.102  | 4.443AspIle: 4.443 ± 0.39  | 2.806AspLys: 2.806 ± 0.24  | 4.063AspLeu: 4.063 ± 0.441  | 0.585AspMet: 0.585 ± 0.13  | 2.923AspAsn: 2.923 ± 0.435  | 0.526AspPro: 0.526 ± 0.125  | 0.38AspGln: 0.38 ± 0.095  | 0.468AspArg: 0.468 ± 0.107  | 1.958AspSer: 1.958 ± 0.228  | 1.023AspThr: 1.023 ± 0.174  | 1.198AspVal: 1.198 ± 0.19  | 0.117AspTrp: 0.117 ± 0.083  | 1.783AspTyr: 1.783 ± 0.225  | 0.0AspXaa: 0.0 ± 0.0  | 
| Glu | 0.585GluAla: 0.585 ± 0.193  | 0.526GluCys: 0.526 ± 0.14  | 1.608GluAsp: 1.608 ± 0.278  | 1.666GluGlu: 1.666 ± 0.327  | 2.28GluPhe: 2.28 ± 0.291  | 1.491GluGly: 1.491 ± 0.262  | 0.322GluHis: 0.322 ± 0.106  | 5.554GluIle: 5.554 ± 0.515  | 4.502GluLys: 4.502 ± 0.459  | 2.631GluLeu: 2.631 ± 0.361  | 0.877GluMet: 0.877 ± 0.173  | 4.151GluAsn: 4.151 ± 0.453  | 0.438GluPro: 0.438 ± 0.123  | 0.322GluGln: 0.322 ± 0.113  | 0.994GluArg: 0.994 ± 0.244  | 2.397GluSer: 2.397 ± 0.304  | 0.906GluThr: 0.906 ± 0.156  | 1.082GluVal: 1.082 ± 0.212  | 0.058GluTrp: 0.058 ± 0.037  | 1.52GluTyr: 1.52 ± 0.209  | 0.0GluXaa: 0.0 ± 0.0  | 
| Phe | 0.409PheAla: 0.409 ± 0.12  | 0.994PheCys: 0.994 ± 0.158  | 2.923PheAsp: 2.923 ± 0.3  | 2.28PheGlu: 2.28 ± 0.258  | 14.469PhePhe: 14.469 ± 1.853  | 2.309PheGly: 2.309 ± 0.352  | 0.555PheHis: 0.555 ± 0.113  | 12.716PheIle: 12.716 ± 0.916  | 14.966PheLys: 14.966 ± 1.132  | 15.463PheLeu: 15.463 ± 1.344  | 1.198PheMet: 1.198 ± 0.198  | 11.722PheAsn: 11.722 ± 0.805  | 0.848PhePro: 0.848 ± 0.235  | 0.731PheGln: 0.731 ± 0.128  | 1.257PheArg: 1.257 ± 0.224  | 6.051PheSer: 6.051 ± 0.512  | 1.286PheThr: 1.286 ± 0.194  | 1.52PheVal: 1.52 ± 0.217  | 0.614PheTrp: 0.614 ± 0.171  | 8.214PheTyr: 8.214 ± 0.767  | 0.0PheXaa: 0.0 ± 0.0  | 
| Gly | 0.818GlyAla: 0.818 ± 0.168  | 0.614GlyCys: 0.614 ± 0.141  | 1.958GlyAsp: 1.958 ± 0.236  | 1.929GlyGlu: 1.929 ± 0.29  | 3.274GlyPhe: 3.274 ± 0.35  | 2.952GlyGly: 2.952 ± 0.414  | 0.585GlyHis: 0.585 ± 0.149  | 4.034GlyIle: 4.034 ± 0.393  | 3.595GlyLys: 3.595 ± 0.346  | 3.42GlyLeu: 3.42 ± 0.308  | 0.38GlyMet: 0.38 ± 0.098  | 2.163GlyAsn: 2.163 ± 0.231  | 0.643GlyPro: 0.643 ± 0.124  | 0.877GlyGln: 0.877 ± 0.149  | 1.695GlyArg: 1.695 ± 0.234  | 2.748GlySer: 2.748 ± 0.372  | 1.169GlyThr: 1.169 ± 0.21  | 1.871GlyVal: 1.871 ± 0.269  | 0.351GlyTrp: 0.351 ± 0.096  | 1.14GlyTyr: 1.14 ± 0.177  | 0.0GlyXaa: 0.0 ± 0.0  | 
| His | 0.263HisAla: 0.263 ± 0.097  | 0.322HisCys: 0.322 ± 0.093  | 0.263HisAsp: 0.263 ± 0.085  | 0.088HisGlu: 0.088 ± 0.044  | 0.731HisPhe: 0.731 ± 0.173  | 0.468HisGly: 0.468 ± 0.127  | 0.322HisHis: 0.322 ± 0.119  | 1.345HisIle: 1.345 ± 0.23  | 1.082HisLys: 1.082 ± 0.176  | 0.789HisLeu: 0.789 ± 0.153  | 0.205HisMet: 0.205 ± 0.078  | 1.052HisAsn: 1.052 ± 0.195  | 0.322HisPro: 0.322 ± 0.107  | 0.058HisGln: 0.058 ± 0.047  | 0.234HisArg: 0.234 ± 0.089  | 0.906HisSer: 0.906 ± 0.17  | 0.292HisThr: 0.292 ± 0.11  | 0.438HisVal: 0.438 ± 0.127  | 0.058HisTrp: 0.058 ± 0.044  | 0.585HisTyr: 0.585 ± 0.134  | 0.0HisXaa: 0.0 ± 0.0  | 
| Ile | 1.491IleAla: 1.491 ± 0.232  | 2.338IleCys: 2.338 ± 0.269  | 4.969IleAsp: 4.969 ± 0.431  | 5.203IleGlu: 5.203 ± 0.505  | 15.726IlePhe: 15.726 ± 1.441  | 3.975IleGly: 3.975 ± 0.336  | 1.374IleHis: 1.374 ± 0.197  | 20.52IleIle: 20.52 ± 0.971  | 22.479IleLys: 22.479 ± 1.267  | 16.749IleLeu: 16.749 ± 0.771  | 2.046IleMet: 2.046 ± 0.186  | 16.983IleAsn: 16.983 ± 0.79  | 2.368IlePro: 2.368 ± 0.292  | 1.695IleGln: 1.695 ± 0.217  | 2.66IleArg: 2.66 ± 0.288  | 10.085IleSer: 10.085 ± 0.535  | 3.245IleThr: 3.245 ± 0.325  | 3.274IleVal: 3.274 ± 0.378  | 0.585IleTrp: 0.585 ± 0.152  | 9.091IleTyr: 9.091 ± 0.602  | 0.0IleXaa: 0.0 ± 0.0  | 
| Lys | 1.082LysAla: 1.082 ± 0.218  | 1.666LysCys: 1.666 ± 0.246  | 3.595LysAsp: 3.595 ± 0.374  | 4.268LysGlu: 4.268 ± 0.543  | 11.196LysPhe: 11.196 ± 0.806  | 4.18LysGly: 4.18 ± 0.371  | 0.965LysHis: 0.965 ± 0.19  | 27.74LysIle: 27.74 ± 1.229  | 26.776LysLys: 26.776 ± 1.695  | 10.143LysLeu: 10.143 ± 0.535  | 1.491LysMet: 1.491 ± 0.259  | 24.905LysAsn: 24.905 ± 1.148  | 1.812LysPro: 1.812 ± 0.222  | 1.52LysGln: 1.52 ± 0.218  | 3.303LysArg: 3.303 ± 0.397  | 7.571LysSer: 7.571 ± 0.497  | 2.982LysThr: 2.982 ± 0.306  | 2.952LysVal: 2.952 ± 0.328  | 0.702LysTrp: 0.702 ± 0.161  | 8.302LysTyr: 8.302 ± 0.564  | 0.0LysXaa: 0.0 ± 0.0  | 
| Leu | 1.257LeuAla: 1.257 ± 0.213  | 0.877LeuCys: 0.877 ± 0.141  | 3.128LeuAsp: 3.128 ± 0.343  | 3.946LeuGlu: 3.946 ± 0.428  | 8.916LeuPhe: 8.916 ± 0.834  | 3.537LeuGly: 3.537 ± 0.329  | 0.877LeuHis: 0.877 ± 0.154  | 13.768LeuIle: 13.768 ± 0.782  | 21.426LeuLys: 21.426 ± 1.138  | 8.126LeuLeu: 8.126 ± 0.516  | 1.023LeuMet: 1.023 ± 0.175  | 16.077LeuAsn: 16.077 ± 0.668  | 1.695LeuPro: 1.695 ± 0.199  | 1.111LeuGln: 1.111 ± 0.18  | 2.602LeuArg: 2.602 ± 0.285  | 6.255LeuSer: 6.255 ± 0.486  | 2.543LeuThr: 2.543 ± 0.206  | 1.842LeuVal: 1.842 ± 0.221  | 0.526LeuTrp: 0.526 ± 0.124  | 5.057LeuTyr: 5.057 ± 0.392  | 0.0LeuXaa: 0.0 ± 0.0  | 
| Met | 0.438MetAla: 0.438 ± 0.117  | 0.234MetCys: 0.234 ± 0.072  | 0.438MetAsp: 0.438 ± 0.176  | 0.585MetGlu: 0.585 ± 0.122  | 1.14MetPhe: 1.14 ± 0.166  | 0.555MetGly: 0.555 ± 0.118  | 0.205MetHis: 0.205 ± 0.094  | 1.871MetIle: 1.871 ± 0.197  | 1.52MetLys: 1.52 ± 0.221  | 1.52MetLeu: 1.52 ± 0.231  | 0.058MetMet: 0.058 ± 0.04  | 1.169MetAsn: 1.169 ± 0.18  | 0.438MetPro: 0.438 ± 0.116  | 0.322MetGln: 0.322 ± 0.1  | 0.234MetArg: 0.234 ± 0.08  | 0.877MetSer: 0.877 ± 0.154  | 0.322MetThr: 0.322 ± 0.092  | 0.497MetVal: 0.497 ± 0.139  | 0.058MetTrp: 0.058 ± 0.044  | 0.614MetTyr: 0.614 ± 0.169  | 0.0MetXaa: 0.0 ± 0.0  | 
| Asn | 1.023AsnAla: 1.023 ± 0.187  | 1.52AsnCys: 1.52 ± 0.209  | 2.543AsnAsp: 2.543 ± 0.331  | 2.865AsnGlu: 2.865 ± 0.324  | 15.668AsnPhe: 15.668 ± 1.148  | 2.192AsnGly: 2.192 ± 0.291  | 0.965AsnHis: 0.965 ± 0.152  | 20.988AsnIle: 20.988 ± 0.954  | 16.399AsnLys: 16.399 ± 0.782  | 13.563AsnLeu: 13.563 ± 0.69  | 1.286AsnMet: 1.286 ± 0.176  | 13.008AsnAsn: 13.008 ± 0.696  | 1.462AsnPro: 1.462 ± 0.178  | 1.228AsnGln: 1.228 ± 0.169  | 2.514AsnArg: 2.514 ± 0.251  | 6.986AsnSer: 6.986 ± 0.485  | 2.134AsnThr: 2.134 ± 0.254  | 2.631AsnVal: 2.631 ± 0.268  | 0.643AsnTrp: 0.643 ± 0.148  | 9.588AsnTyr: 9.588 ± 0.53  | 0.0AsnXaa: 0.0 ± 0.0  | 
| Pro | 0.38ProAla: 0.38 ± 0.112  | 0.117ProCys: 0.117 ± 0.058  | 0.585ProAsp: 0.585 ± 0.12  | 0.848ProGlu: 0.848 ± 0.203  | 1.169ProPhe: 1.169 ± 0.158  | 0.935ProGly: 0.935 ± 0.213  | 0.234ProHis: 0.234 ± 0.082  | 2.046ProIle: 2.046 ± 0.261  | 1.286ProLys: 1.286 ± 0.226  | 1.842ProLeu: 1.842 ± 0.232  | 0.234ProMet: 0.234 ± 0.071  | 1.403ProAsn: 1.403 ± 0.201  | 0.234ProPro: 0.234 ± 0.08  | 0.234ProGln: 0.234 ± 0.084  | 0.38ProArg: 0.38 ± 0.13  | 1.286ProSer: 1.286 ± 0.2  | 0.76ProThr: 0.76 ± 0.165  | 0.731ProVal: 0.731 ± 0.151  | 0.029ProTrp: 0.029 ± 0.036  | 0.906ProTyr: 0.906 ± 0.143  | 0.0ProXaa: 0.0 ± 0.0  | 
| Gln | 0.526GlnAla: 0.526 ± 0.133  | 0.234GlnCys: 0.234 ± 0.082  | 0.38GlnAsp: 0.38 ± 0.084  | 0.468GlnGlu: 0.468 ± 0.134  | 0.585GlnPhe: 0.585 ± 0.121  | 0.643GlnGly: 0.643 ± 0.157  | 0.117GlnHis: 0.117 ± 0.064  | 2.251GlnIle: 2.251 ± 0.285  | 1.491GlnLys: 1.491 ± 0.211  | 0.848GlnLeu: 0.848 ± 0.152  | 0.351GlnMet: 0.351 ± 0.101  | 1.14GlnAsn: 1.14 ± 0.208  | 0.263GlnPro: 0.263 ± 0.084  | 0.175GlnGln: 0.175 ± 0.069  | 0.438GlnArg: 0.438 ± 0.145  | 0.818GlnSer: 0.818 ± 0.157  | 0.322GlnThr: 0.322 ± 0.101  | 0.555GlnVal: 0.555 ± 0.126  | 0.117GlnTrp: 0.117 ± 0.062  | 0.526GlnTyr: 0.526 ± 0.123  | 0.0GlnXaa: 0.0 ± 0.0  | 
| Arg | 0.38ArgAla: 0.38 ± 0.11  | 0.234ArgCys: 0.234 ± 0.075  | 0.702ArgAsp: 0.702 ± 0.131  | 0.848ArgGlu: 0.848 ± 0.137  | 1.842ArgPhe: 1.842 ± 0.167  | 1.608ArgGly: 1.608 ± 0.281  | 0.409ArgHis: 0.409 ± 0.122  | 2.952ArgIle: 2.952 ± 0.28  | 3.303ArgLys: 3.303 ± 0.425  | 1.929ArgLeu: 1.929 ± 0.307  | 0.205ArgMet: 0.205 ± 0.094  | 2.485ArgAsn: 2.485 ± 0.322  | 0.292ArgPro: 0.292 ± 0.102  | 0.497ArgGln: 0.497 ± 0.121  | 0.614ArgArg: 0.614 ± 0.116  | 1.725ArgSer: 1.725 ± 0.226  | 0.614ArgThr: 0.614 ± 0.155  | 1.169ArgVal: 1.169 ± 0.193  | 0.088ArgTrp: 0.088 ± 0.047  | 1.286ArgTyr: 1.286 ± 0.186  | 0.0ArgXaa: 0.0 ± 0.0  | 
| Ser | 1.14SerAla: 1.14 ± 0.217  | 1.082SerCys: 1.082 ± 0.177  | 2.163SerAsp: 2.163 ± 0.26  | 2.426SerGlu: 2.426 ± 0.293  | 5.554SerPhe: 5.554 ± 0.562  | 3.449SerGly: 3.449 ± 0.371  | 0.848SerHis: 0.848 ± 0.155  | 8.565SerIle: 8.565 ± 0.474  | 8.039SerLys: 8.039 ± 0.419  | 7.308SerLeu: 7.308 ± 0.523  | 0.614SerMet: 0.614 ± 0.164  | 6.109SerAsn: 6.109 ± 0.365  | 1.169SerPro: 1.169 ± 0.174  | 1.023SerGln: 1.023 ± 0.159  | 1.695SerArg: 1.695 ± 0.248  | 4.18SerSer: 4.18 ± 0.457  | 1.52SerThr: 1.52 ± 0.237  | 1.812SerVal: 1.812 ± 0.264  | 0.438SerTrp: 0.438 ± 0.128  | 3.888SerTyr: 3.888 ± 0.388  | 0.0SerXaa: 0.0 ± 0.0  | 
| Thr | 0.468ThrAla: 0.468 ± 0.142  | 0.322ThrCys: 0.322 ± 0.094  | 0.789ThrAsp: 0.789 ± 0.14  | 1.052ThrGlu: 1.052 ± 0.237  | 1.403ThrPhe: 1.403 ± 0.202  | 1.403ThrGly: 1.403 ± 0.191  | 0.322ThrHis: 0.322 ± 0.105  | 3.508ThrIle: 3.508 ± 0.301  | 1.988ThrLys: 1.988 ± 0.24  | 2.777ThrLeu: 2.777 ± 0.28  | 0.351ThrMet: 0.351 ± 0.147  | 2.075ThrAsn: 2.075 ± 0.257  | 0.965ThrPro: 0.965 ± 0.162  | 0.234ThrGln: 0.234 ± 0.075  | 0.994ThrArg: 0.994 ± 0.193  | 1.491ThrSer: 1.491 ± 0.187  | 1.023ThrThr: 1.023 ± 0.206  | 0.965ThrVal: 0.965 ± 0.19  | 0.058ThrTrp: 0.058 ± 0.046  | 1.257ThrTyr: 1.257 ± 0.165  | 0.0ThrXaa: 0.0 ± 0.0  | 
| Val | 0.672ValAla: 0.672 ± 0.205  | 0.555ValCys: 0.555 ± 0.132  | 0.994ValAsp: 0.994 ± 0.17  | 1.491ValGlu: 1.491 ± 0.233  | 2.222ValPhe: 2.222 ± 0.251  | 1.812ValGly: 1.812 ± 0.225  | 0.438ValHis: 0.438 ± 0.123  | 3.245ValIle: 3.245 ± 0.336  | 2.806ValLys: 2.806 ± 0.31  | 2.806ValLeu: 2.806 ± 0.283  | 0.614ValMet: 0.614 ± 0.11  | 2.017ValAsn: 2.017 ± 0.253  | 0.555ValPro: 0.555 ± 0.109  | 0.438ValGln: 0.438 ± 0.128  | 0.789ValArg: 0.789 ± 0.157  | 1.432ValSer: 1.432 ± 0.247  | 0.877ValThr: 0.877 ± 0.216  | 0.789ValVal: 0.789 ± 0.139  | 0.175ValTrp: 0.175 ± 0.074  | 1.432ValTyr: 1.432 ± 0.191  | 0.0ValXaa: 0.0 ± 0.0  | 
| Trp | 0.146TrpAla: 0.146 ± 0.065  | 0.029TrpCys: 0.029 ± 0.026  | 0.205TrpAsp: 0.205 ± 0.092  | 0.175TrpGlu: 0.175 ± 0.072  | 0.497TrpPhe: 0.497 ± 0.142  | 0.322TrpGly: 0.322 ± 0.093  | 0.029TrpHis: 0.029 ± 0.032  | 0.643TrpIle: 0.643 ± 0.136  | 0.614TrpLys: 0.614 ± 0.131  | 0.497TrpLeu: 0.497 ± 0.118  | 0.263TrpMet: 0.263 ± 0.102  | 0.438TrpAsn: 0.438 ± 0.111  | 0.088TrpPro: 0.088 ± 0.049  | 0.029TrpGln: 0.029 ± 0.034  | 0.234TrpArg: 0.234 ± 0.105  | 0.38TrpSer: 0.38 ± 0.116  | 0.117TrpThr: 0.117 ± 0.075  | 0.117TrpVal: 0.117 ± 0.061  | 0.117TrpTrp: 0.117 ± 0.066  | 0.234TrpTyr: 0.234 ± 0.084  | 0.0TrpXaa: 0.0 ± 0.0  | 
| Tyr | 0.672TyrAla: 0.672 ± 0.136  | 1.198TyrCys: 1.198 ± 0.165  | 1.637TyrAsp: 1.637 ± 0.215  | 1.257TyrGlu: 1.257 ± 0.185  | 7.892TyrPhe: 7.892 ± 0.705  | 1.666TyrGly: 1.666 ± 0.23  | 0.38TyrHis: 0.38 ± 0.11  | 7.863TyrIle: 7.863 ± 0.571  | 9.149TyrLys: 9.149 ± 0.546  | 6.957TyrLeu: 6.957 ± 0.483  | 0.935TyrMet: 0.935 ± 0.185  | 7.542TyrAsn: 7.542 ± 0.575  | 0.789TyrPro: 0.789 ± 0.15  | 0.818TyrGln: 0.818 ± 0.111  | 1.345TyrArg: 1.345 ± 0.204  | 3.946TyrSer: 3.946 ± 0.286  | 1.228TyrThr: 1.228 ± 0.18  | 1.169TyrVal: 1.169 ± 0.211  | 0.263TyrTrp: 0.263 ± 0.073  | 4.56TyrTyr: 4.56 ± 0.433  | 0.0TyrXaa: 0.0 ± 0.0  | 
| Xaa | 0.0XaaAla: 0.0 ± 0.0  | 0.0XaaCys: 0.0 ± 0.0  | 0.0XaaAsp: 0.0 ± 0.0  | 0.0XaaGlu: 0.0 ± 0.0  | 0.0XaaPhe: 0.0 ± 0.0  | 0.0XaaGly: 0.0 ± 0.0  | 0.0XaaHis: 0.0 ± 0.0  | 0.0XaaIle: 0.0 ± 0.0  | 0.0XaaLys: 0.0 ± 0.0  | 0.0XaaLeu: 0.0 ± 0.0  | 0.0XaaMet: 0.0 ± 0.0  | 0.0XaaAsn: 0.0 ± 0.0  | 0.0XaaPro: 0.0 ± 0.0  | 0.0XaaGln: 0.0 ± 0.0  | 0.0XaaArg: 0.0 ± 0.0  | 0.0XaaSer: 0.0 ± 0.0  | 0.0XaaThr: 0.0 ± 0.0  | 0.0XaaVal: 0.0 ± 0.0  | 0.0XaaTrp: 0.0 ± 0.0  | 0.0XaaTyr: 0.0 ± 0.0  | 0.0XaaXaa: 0.0 ± 0.0  | 
| Reference: Kozlowski LP. Proteome-pI 2.0: Proteome Isoelectric Point Database Update. Nucleic Acids Res. 2021, doi: 10.1093/nar/gkab944 | Contact: Lukasz P. Kozlowski |