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

NOTE THAT IN THE ALIGNMENTS BELOW, GAPS MOST LIKELY INDICATE
RESIDUES MISSING IN THE ELECTRON DENSITY. 


Alignment: 1GRN_A against 1A4R_A
Query=
(191 letters)

>1A4R_A
Length = 190

Score = 385 bits (988), Expect = e-112
Identities = 189/190 (99%), Positives = 189/190 (99%)

Query: 1 MQTIKCVVVGDGAVGKTCLLISYTTNKFPSEYVPTVFDNYAVTVMIGGEPYTLGLFDTAG 60
MQTIKCVVVGD AVGKTCLLISYTTNKFPSEYVPTVFDNYAVTVMIGGEPYTLGLFDTAG
Sbjct: 1 MQTIKCVVVGDVAVGKTCLLISYTTNKFPSEYVPTVFDNYAVTVMIGGEPYTLGLFDTAG 60

Query: 61 QEDYDRLRPLSYPQTDVFLVCFSVVSPSSFENVKEKWVPEITHHCPKTPFLLVGTQIDLR 120
QEDYDRLRPLSYPQTDVFLVCFSVVSPSSFENVKEKWVPEITHHCPKTPFLLVGTQIDLR
Sbjct: 61 QEDYDRLRPLSYPQTDVFLVCFSVVSPSSFENVKEKWVPEITHHCPKTPFLLVGTQIDLR 120

Query: 121 DDPSTIEKLAKNKQKPITPETAEKLARDLKAVKYVECSALTQKGLKNVFDEAILAALEPP 180
DDPSTIEKLAKNKQKPITPETAEKLARDLKAVKYVECSALTQKGLKNVFDEAILAALEPP
Sbjct: 121 DDPSTIEKLAKNKQKPITPETAEKLARDLKAVKYVECSALTQKGLKNVFDEAILAALEPP 180

Query: 181 EPKKSRRCVL 190
EPKKSRRCVL
Sbjct: 181 EPKKSRRCVL 190


Alignment: 1GRN_B against 1RGP_
Query=
(197 letters)

>1RGP_
Length = 189

Score = 364 bits (935), Expect = e-106
Identities = 185/195 (94%), Positives = 185/195 (94%), Gaps = 10/195 (5%)

Query: 1 LPNQQFGVSLQHLQEKNPEQEPIPIVLRETVAYLQAHALTTEGIFRRSANTQVVREVQQK 60
LPNQQFGVSLQHLQEKNPEQEPIPIVLRETVAYLQAHALTTEGIFRRSANTQVVREVQQK
Sbjct: 5 LPNQQFGVSLQHLQEKNPEQEPIPIVLRETVAYLQAHALTTEGIFRRSANTQVVREVQQK 64

Query: 61 YNMGLPVDFDQYNELHLPAVILKTFLRELPEPLLTFDLYPHVVGFLNIDESQRVPATLQV 120
YNMGLPVDFDQYNELHLPAVILKTFLRELPEPLLTFDLYPHVVGFLNIDESQRVPATLQV
Sbjct: 65 YNMGLPVDFDQYNELHLPAVILKTFLRELPEPLLTFDLYPHVVGFLNIDESQRVPATLQV 124

Query: 121 LQTLPEENYQVLRFLTAFLVQISAHSDQNKMTNTNLAVVFGPNLLWAKDAAITLKAINPI 180
LQTLPEENYQVLRFLTAFLVQISAHSDQNKMTNTNLAVVFGPNLLW INPI
Sbjct: 125 LQTLPEENYQVLRFLTAFLVQISAHSDQNKMTNTNLAVVFGPNLLW----------INPI 174

Query: 181 NTFTKFLLDHQGELF 195
NTFTKFLLDHQGELF
Sbjct: 175 NTFTKFLLDHQGELF 189