21 domains, 4 groups, pruneval=10
1 [1aj600,gyrB] [1ei1A0,gyrB] [1ei1B0,gyrB]
2 [1b62A0,mutl] [1b63A0,mutl] [1bknA0,mutl] [1bknB0,mutl]
3 [1a4h00,hsp90] [1ah600,hsp90,] [1ah8A0,hsp90] [1ah8B0,hsp90] [1am100,hsp90] [1amw00,hsp90] [1bgq00,hsp90] [1byqA0,hsp90]
[1yer00,hsp90] [1yes00,hsp90] [1yet00,hsp90]
4 [1b3qA0,hisK] [1b3qB0,hisK] [1bxdA0,hisK]