The benchmark cases 1GRN_A:B, 1WQ1_G:R might be considered redundant and the choice is left to the user. 

1GRN_A and 1WQ1_R fall into the same SCOP Family.  1GRN_B and 1WQ1_G fall into the same SCOP Superfamily
but different Families.  The sequence identities for the corresponding sequences are low.  The rasmol files with aligned
complexes are here:

align_1grn_1wq1.ras


Alignment: 1WQ1_G against 1WER_
Query=
(320 letters)

>1WER_
Length = 324

Score = 627 bits (1617), Expect = 0.0
Identities = 320/320 (100%), Positives = 320/320 (100%)

Query: 1 MPEEEYSEFKELILQKELHVVYALSHVCGQDRTLLASILLRIFLHEKLESLLLCTLNDRE 60
MPEEEYSEFKELILQKELHVVYALSHVCGQDRTLLASILLRIFLHEKLESLLLCTLNDRE
Sbjct: 1 MPEEEYSEFKELILQKELHVVYALSHVCGQDRTLLASILLRIFLHEKLESLLLCTLNDRE 60

Query: 61 ISMEDEATTLFRATTLASTLMEQYMKATATQFVHHALKDSILKIMESKQSCELSPSKLEK 120
ISMEDEATTLFRATTLASTLMEQYMKATATQFVHHALKDSILKIMESKQSCELSPSKLEK
Sbjct: 61 ISMEDEATTLFRATTLASTLMEQYMKATATQFVHHALKDSILKIMESKQSCELSPSKLEK 120

Query: 121 NEDVNTNLTHLLNILSELVEKIFMASEILPPTLRYIYGCLQKSVQHKWPTNTTMRTRVVS 180
NEDVNTNLTHLLNILSELVEKIFMASEILPPTLRYIYGCLQKSVQHKWPTNTTMRTRVVS
Sbjct: 121 NEDVNTNLTHLLNILSELVEKIFMASEILPPTLRYIYGCLQKSVQHKWPTNTTMRTRVVS 180

Query: 181 GFVFLRLICPAILNPRMFNIISDSPSPIAARTLILVAKSVQNLANLVEFGAKEPYMEGVN 240
GFVFLRLICPAILNPRMFNIISDSPSPIAARTLILVAKSVQNLANLVEFGAKEPYMEGVN
Sbjct: 181 GFVFLRLICPAILNPRMFNIISDSPSPIAARTLILVAKSVQNLANLVEFGAKEPYMEGVN 240

Query: 241 PFIKSNKHRMIMFLDELGNVPELPDTTEHSRTDLSRDLAALHEICVAHSDELRTLSNERG 300
PFIKSNKHRMIMFLDELGNVPELPDTTEHSRTDLSRDLAALHEICVAHSDELRTLSNERG
Sbjct: 241 PFIKSNKHRMIMFLDELGNVPELPDTTEHSRTDLSRDLAALHEICVAHSDELRTLSNERG 300

Query: 301 AQQHVLKKLLAITELLQQKQ 320
AQQHVLKKLLAITELLQQKQ
Sbjct: 301 AQQHVLKKLLAITELLQQKQ 320


Alignment: 1WQ1_R against 6Q21_D
Query=
(166 letters)

>6Q21_D
Length = 171

Score = 333 bits (853), Expect = 1e-96
Identities = 166/166 (100%), Positives = 166/166 (100%)

Query: 1 MTEYKLVVVGAGGVGKSALTIQLIQNHFVDEYDPTIEDSYRKQVVIDGETCLLDILDTAG 60
MTEYKLVVVGAGGVGKSALTIQLIQNHFVDEYDPTIEDSYRKQVVIDGETCLLDILDTAG
Sbjct: 1 MTEYKLVVVGAGGVGKSALTIQLIQNHFVDEYDPTIEDSYRKQVVIDGETCLLDILDTAG 60

Query: 61 QEEYSAMRDQYMRTGEGFLCVFAINNTKSFEDIHQYREQIKRVKDSDDVPMVLVGNKCDL 120
QEEYSAMRDQYMRTGEGFLCVFAINNTKSFEDIHQYREQIKRVKDSDDVPMVLVGNKCDL
Sbjct: 61 QEEYSAMRDQYMRTGEGFLCVFAINNTKSFEDIHQYREQIKRVKDSDDVPMVLVGNKCDL 120

Query: 121 AARTVESRQAQDLARSYGIPYIETSAKTRQGVEDAFYTLVREIRQH 166
AARTVESRQAQDLARSYGIPYIETSAKTRQGVEDAFYTLVREIRQH
Sbjct: 121 AARTVESRQAQDLARSYGIPYIETSAKTRQGVEDAFYTLVREIRQH 166