4.   f.20.1        Clc chloride channel    
                   Clc chloride channel core: 18 transmembrane helices
                   1kpl  d1kplc_  C:248-285,315-327,329-351,355-380,385-403
                   2h2s  d2h2sa1  A:32-72,107-118,123-142,146-167,170-191
                   2h2s  d2h2sb1  B:32-72,107-118,123-142,146-167,170-191
                   2ht2  d2ht2a1  A:32-72,107-118,123-142,146-167,170-191
                   2exw  d2exwa1  A:32-72,107-118,123-142,146-167,170-191
                   1ots  d1otsa_  A:32-72,107-118,123-142,146-167,170-191
                   1ots  d1otsb_  B:32-72,107-118,123-142,146-167,170-191
                   2htk  d2htka1  A:32-72,107-118,123-142,146-167,170-191
                   2fee  d2feea1  A:32-72,107-118,123-142,146-167,170-191
                   2exy  d2exya1  A:32-72,107-118,123-142,146-167,170-191
                   2exw  d2exwb1  B:32-72,107-118,123-142,146-167,170-191
                   2hlf  d2hlfa1  A:32-72,107-118,123-142,146-167,170-191
                   2fec  d2feca1  A:32-72,107-118,123-142,146-167,170-191
                   2ht2  d2ht2b1  B:32-72,107-118,123-142,146-167,170-191
                   1kpk  d1kpkf_  F:32-72,107-118,123-142,146-167,170-191
                   1kpk  d1kpkb_  B:32-72,107-118,123-142,146-167,170-191
                   1kpk  d1kpkc_  C:32-72,107-118,123-142,146-167,170-191
                   1kpk  d1kpkd_  D:32-72,107-118,123-142,146-167,170-191
                   1kpk  d1kpke_  E:32-72,107-118,123-142,146-167,170-191
                   1kpk  d1kpka_  A:32-72,107-118,123-142,146-167,170-191
                   2exy  d2exyb1  B:32-72,107-118,123-142,146-167,170-191
                   2hlf  d2hlfb1  B:32-72,107-118,123-142,146-167,170-191
                   2htk  d2htkb1  B:32-72,107-118,123-142,146-167,170-191
                   2htl  d2htlb1  B:32-72,107-118,123-142,146-167,170-191
                   2htl  d2htla1  A:32-72,107-118,123-142,146-167,170-191
                   2ht3  d2ht3b1  B:32-72,107-118,123-142,146-167,170-191
                   2ez0  d2ez0b1  B:32-72,107-118,123-142,146-167,170-191
                   2fee  d2feeb1  B:32-72,107-118,123-142,146-167,170-191
                   2ez0  d2ez0a1  A:32-72,107-118,123-142,146-167,170-191
                   2ht4  d2ht4b1  B:32-72,107-118,123-142,146-167,170-191
                   1otu  d1otua_  A:32-72,107-118,123-142,146-167,170-191
                   2fec  d2fecb1  B:32-72,107-118,123-142,146-167,170-191
                   1otu  d1otub_  B:32-72,107-118,123-142,146-167,170-191
                   2ht3  d2ht3a1  A:32-72,107-118,123-142,146-167,170-191
                   2ht4  d2ht4a1  A:32-72,107-118,123-142,146-167,170-191
                   2fed  d2feda1  A:32-72,107-118,123-142,146-167,170-191
                   1kpl  d1kplb_  B:32-72,107-118,123-142,146-167,170-191
                   1kpl  d1kpld_  D:32-72,107-118,123-142,146-167,170-191
                   2fed  d2fedb1  B:32-72,107-118,123-142,146-167,170-191
                   1kpl  d1kpla_  A:248-285,315-327,329-351,356-380,385-403
                   2h2p  d2h2pa1  A:32-72,107-118,123-142,146-167,170-191
                   2h2p  d2h2pb1  B:32-72,107-118,123-142,146-167,170-191
                   1ott  d1ottb_  B:32-72,107-118,123-142,146-167,170-191
                   1ott  d1otta_  A:32-72,107-118,123-142,146-167,170-191
                   1kpl  d1kplc_  C:31-75,107-118,123-142,146-167,170-191
                   1kpl  d1kpla_  A:31-75,107-118,123-142,146-167,170-191

6.   f.38.1        MFS general substrate transporter    
                   MFS general substrate transporter 12 transmembrane helices; duplication: the N- and C-terminal halves are structurally similar
                   1pv7  d1pv7b_  B:6-39,41-60,86-102,103-137,219-251
                   1pv7  d1pv7a_  A:6-39,41-60,86-102,103-137,219-251
                   1pv6  d1pv6b_  B:6-39,41-60,86-102,103-137,219-251
                   1pv6  d1pv6a_  A:6-39,41-60,86-102,103-137,219-251
                   1pw4  d1pw4a_  A:18-57,62-83,91-114,119-149,401-412
                   1pw4  d1pw4a_  A:18-57,62-83,91-114,119-149,275-285
                   1pw4  d1pw4a_  A:18-57,62-83,91-114,119-149,252-276