>3D_helix;56
            protein_name:KcsA potassium channel* (S. lividans)
            file_name:KcsA.txt
            entry_date:25jun98
            refman_number:15161
            endnote_number:
            author:Doyle,D.A., Cabral,J.M., Pfuetzner,R.A., Kuo,A., Gulbis,J.M., Cohen,S.L., Chait,B.T., MacKinnon,R. (1998) [The structure of the potassium channel: Molecular basis of K+ conduction and selectivity] {Science, 280, 69-77}
            remarks:*The 'tmsegs' marked below include the so-called pore helix (P) associated with the pore region. 'tmseg' B corresponds to P. TMhelices=2.
            pir_number:S60172
            Swiss_Prot_entry:KCSA_STRCO
            Swiss_Prot_number:Q54397
            Swiss_Prot_gene:KCSA,SKC1,SCO7660,SC10F4.33
            Swiss_Prot_name:Voltage-gated potassium channel
            PDB_title:Potassium Channel (KcsA) from Streptomyces lividans
            PDB_Identifier:1BL8
            N_terminal:in
            number_tmsegs:3
            tm_segments:A.28,52;B.62,72;C.87,113
            sequence:MPPMLSGLLARLVKLLLGRHGSALHWRAAGAATVLLVIVLLAGSYLAVLAERGAPGAQLITYPRALWWSVETATTVGYGDLYPVTLWGRCVAVVVMVAGITSFGLVTAALATWFVGREQ*