Twin directories of bk:

[DIR]  ftp://ftp.eimb.ru/PDB/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/biounit/coordinates/divided/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/divided/structure_factors/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/divided/XML-extatom/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/divided/XML-noatom/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/divided/XML/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/divided/mmCIF/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/divided/pdb/bk/
[DIR]  ftp://ftp.vak.ru/bk/
[DIR]  ftp://213.115.0.11/pub/software/getdeb/bk/
[DIR]  ftp://ftp13.freebsd.org/pub/www.getdeb.net/bk/
[DIR]  ftp://ftp.mainstreet.net/pub/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/obsolete/XML/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/obsolete/mmCIF/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/obsolete/nmr_restraints/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/obsolete/pdb/bk/
[DIR]  ftp://files.akl.lt/Linux/Ubuntu/getdeb/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb-remediated/data/structures/divided/nmr_restraints/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb/data/structures/divided/XML-extatom/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb/data/structures/divided/XML-noatom/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb/data/structures/divided/XML/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb/data/structures/divided/mmCIF/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb/data/structures/divided/pdb/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/obsolete/nmr_restraints/bk/
[DIR]  ftp://ftp.zenez.com/pub/SCO/skunkware/osr5/devtools/bk/
[DIR]  ftp://ftp.mips.com/bk/
[DIR]  ftp://ftp.uniroma2.it/{E/Linux/suse/ftp.suse.com/people/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb/data/structures/divided/structure_factors/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/biounit/coordinates/divided/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/divided/XML-extatom/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/divided/XML-noatom/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/divided/XML/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/divided/mmCIF/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/divided/pdb/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/divided/structure_factors/bk/
[DIR]  ftp://ftp.cs.monash.edu.au/users/hws/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb/data/structures/obsolete/mmCIF/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb/data/structures/obsolete/XML/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/obsolete/XML/bk/
[DIR]  ftp://ftp.ebi.ac.uk/pub/databases/rcsb/pdb/data/structures/obsolete/pdb/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/obsolete/mmCIF/bk/
[DIR]  ftp://ftp.rcsb.org/pub/pdb/data/structures/obsolete/pdb/bk/
[DIR]  ftp://ftp.tu-chemnitz.de/.SAN0/pub/linux/suse/ftp.suse.com/people/bk/
[DIR]  ftp://ftp.hosteurope.de/mirror/ftp.suse.com/pub/people/bk/
[DIR]  ftp://ftp.skynet.be/mirror2/suse.com/people/bk/
[DIR]  ftp://ftp.esat.net/mirrors/.1/ftp.suse.com/pub/people/bk/
[DIR]  ftp://ftp.li.kernel.org/pub/.3/ftp.suse.com/pub/people/bk/
[DIR]  ftp://ftp.informatik.rwth-aachen.de/pub/comp/Linux/suse/people/bk/
[DIR]  ftp://ftp.uni-kl.de/pub/linux/suse/people/bk/
[DIR]  ftp://ftp.hs.uni-hamburg.de/pub/mirrors/suse/people/bk/