| 2.1 | Class: Nuclear receptors with C4 zinc fingers (C4-NR), Alignment | 
| Aligned C4-NR domain sequences: | |
PKLCLVCSDEASGCHYGVLTCGSCKVFFKRAVEGQH--NYLCAG-RND-CIIDKIRRKNCPACRYRKCLQAGM GR SKICLVCGDEASGCHYGVVTCGSCKVFFKRAVEGQH--NYLCAG-RND-CIIDKIRRKNCPACRLQKCLQAGM MR QKICLICGDEASGCHYGVLTCGSCKVFFKRAMEGQH--NYLCAG-RND-CIVDKIRRKNCPACRLRKCCQAGM PR QKTCLICGDEASGCHYGALTCGSCKVFFKRAAEGKQ--KYLCAS-RND-CTIDKFRRKNCPSCRLRKCYEAGM AR TRYCAVCNDYASGYHYGVWSCEGCKAFFKRSIQGHN--DYMCPA-TNQ-CTIDKNRRKSCQACRLRKCYEVGM ER AHFCAVCSDYASGYHYGVWSCEGCKAFFKRSIQGHN--DYICPA-TNQ-CTIDKNRRKSCQACRLRKCYEVGM ERbeta KRLCLVCGDVASGYHYGVASCEACKAFFKRTIQGSI--EYSCPA-SNE-CEITKRRRKACQACRFTKCLRVGM ERRalpha KRLCLVCGDIASGYHYGVASCEACKAFFKRTIQGNI--EYSCPA-TNE-CEITKRRRKSCQACRFMKCLKVGM ERRbeta KRLCLVCGDIASGYHYGVASCEACKAFFKRTIQGNI--EYSCPA-TNE-CEITKRRRKSCQACRFMKCLKVGM ERRgamma YKPCFVCQDKSSGYHYGVSACEGCKGFFRRSIQKNM--VYTCHR-DKN-CIINKVTRNRCQYCRLQKCFEVGM RARalpha YKPCFVCQDKSSGYHYGVSACEGCKGFFRRSIQKNM--IYTCHR-DKN-CVINKVTRNRCQYCRLQKCFEVGM RARbeta YKPCFVCNDKSSGYHYGVSSCEGCKGFFRRSIQKNM--VYTCHR-DKN-CIINKVTRNRCQYCRLQKCFEVGM RARgamma DEQCVVCGDKATGYHYRCITCEGCKGFFRRTIQKNLHPTYSCKY-DSC-CVIDKITRNQCQLCRFKKCIAVGM T3Ralpha DELCVVCGDKATGYHYRCITCEGCKGFFRRTIQKNLHPSYSCKY-EGK-CVIDKVTRNQCQECRFKKCIYVGM T3Rbeta VLLCKVCGDVASGFHYGVHACEGCKGFFRRSIQQNIQ-YKRCLK-NEN-CSIVRINRNRCQQCRFKKCLSVGM Rev-erbA-alpha VLLCKVCGDVASGFHYGVHACEGCKGFFRRSIQQNIQ-YKKCLK-NEN-CSIMRMNRNRCQQCRFKKCLSVGM Rev-erbA-beta PRICGVCGDRATGFHFNAMTCEGCKGFFRRSMKRKA--LFTCPF-NGD-CRITKDNRRHCQACRLKRCVDIGM VDR PQICRVCGDKATGYHFNVMTCEGCKGFFRRAMKRNA--RLRCPF-RKGACEITRKTRRQCQACRLRKCLESGM PXR LRNCVVCGDQATGYHFNALTCEGCKGFFRRTVSKSI--GPTCPF-AGS-CEVSKTQRRHCPACRLQKCLDAGM CAR NIECRICGDKASGYHYGVHACEGCKGFFRRTIRLKLV-YDKC---DRS-CKIQKKNRNKCQYCRFHKCLSVGM PPARalpha NMECRVCGDKASGFHYGVHACEGCKGFFRRTIRMKLE-YEKC---ERS-CKIQKKNRNKCQYCRFQKCLALGM PPARbeta AIECRVCGDKASGFHYGVHACEGCKGFFRRTIRLKLI-YDRC---DLN-CRIHKKSRNKCQYCRFQKCLAVGM PPARgamma IIPCKICGDKSSGIHYGVITCEGCKGFFRRSQQSNA--TYSCPR-QKN-CLIDRTSRNRCQHCRLQKCLAVGM RORalpha VIPCKICGDKSSGIHYGVITCEGCKGFFRRSQQNNA--SYSCPR-QRN-CLIDRTNRNRCQHCRLQKCLALGM RORbeta VIPCKICGDKSSGIHYGVITCEGCKGFFRRSQRCNA--AYSCTR-QQN-CPIDRTSRNRCQHCRLQKCLALGM RORgamma NELCSVCGDKASGFHYNVLSCEGCKGFFRRSVIKGA--HYICHS-GGH-CPMDTYMRRKCQECRLRKCRQAGM LXRalpha HELCRVCGDKASGFHYNVLSCEGCKGFFRRSVVRGGARRYACRG-GGT-CQMDAFMRRKCQQCRLRKCKEAGM LXRbeta DELCVVCGDRASGYHYNALTCEGCKGFFRRSITKNA--VYKCKN-GGN-CVMDMYMRRKCQECRLRKCKEMGM FXR KHICAICGDRSSGKHYGVYSCEGCKGFFKRTVRKDL--TYTCRD-NKD-CLIDKRQRNRCQYCRYQKCLAMGM RXRalpha RKLCAICGDRSSGKHYGVYSCEGCKGFFKRTIRKDL--TYSCRD-NKD-CTVDKRQRNRCQYCRYQKCLATGM RXR-beta KHICAICGDRSSGKHYGVYSCEGCKGFFKRTIRKDL--IYTCRD-NKD-CLIDKRQRNRCQYCRYQKCLVMGM RXRgamma SALCAICGDRATGKHYGASSCDGCKGFFRRSVRKNH--MYSCRF-SRQ-CVVDKDKRNQCRYCRLKKCFRAGM HNF4alpha NCLCAICGDRATGKHYGASSCDGCKGFFRRSIRKSH--VYSCRF-SRQ-CVVDKDKRNQCRYCRLRKCFRAGM HNF4gamma DIPCKVCGDRSSGKHYGVYACDGCSGFFKRSIRRNR--TYVCKSGNQGGCPVDKTHRNQCRACRLKKCLEVNM Tlx SLQCRVCGDSSSGKHYGIYACNGCSGFFKRSVRRRL--IYRCQVGA-GMCPVDKAHRNQCQACRLKKCLQAGM PNR FDLCVVCGDKASGRHYGAVTCEGCKGFFKRSIRKNL--VYSCRG-SKD-CIINKHHRNRCQYCRLQRCIAFGM TR2 VEYCVVCGDKASGRHYGAVSCEGCKGFFKRSVRKNL--TYSCRS-NQD-CIINKHHRNRCQFCRLKKCLEMGM TR4 HIECVVCGDKSSGKHYGQFTCEGCKSFFKRSVRRNL--TYTCRA-NRN-CPIDQHHRNQCQYCRLKKCLKVGM COUP-TFI HIECVVCGDKSSGKHYGQFTCEGCKSFFKRSVRRNL--SYTCRA-NRN-CPIDQHHRNQCQYCRLKKCLKVGM COUP-TFII QVDCVVCGDKSSGKHYGVFTCEGCKSFFKRSIRRNL--SYTCRS-NRD-CQIDQHHRNQCQYCRLKKCFRVGM EAR2 EGRCAVCGDNASCQHYGVRTCEGCKGFFKRTVQKNA--KYICLA-NKD-CPVDKRRRNRCQFCRFQKCLAVGM NGFI-B/TR3 EGLCAVCGDNAACQHYGVRTCEGCKGFFKRTVQKNA--KYVCLA-NKN-CPVDKRRRNRCQYCRFQKCLAVGM NURR1 EGTCAVCGDNAACQHYGVRTCEGCKGFFKRTVQKNA--KYVCLA-NKN-CPVDKRRRNRCQYCRFQKCLSVGM NOR-1 DELCPVCGDKVSGYHYGLLTCESCKGFFKRTVQNNK--HYTCTE-SQS-CKIDKTQRKRCPFCRFQKCLTVGM FTZ-F1 EELCPVCGDKVSGYHYGLLTCESCKGFFKRTVQNNK--RYTCIE-NQN-CQIDKTQRKRCPYCRFQKCLSVGM LRH-1 QRTCLICGDRATGLHYGIISCEGCKGFFKRSICNKR..VYRCSR-DKN-CVMSRKQRNRCQYCRLLKCLQMGM GNCF