Supplementary Table.  Summary of variations in unit cell dimensions.

Crystal	Unit Cell	Resolution	Beamline	
	a	b	c			
Native	Direct Freeze	91.9	146.3	81.1	3.8	14BMC	
	40% Peg 400	89.1	136.1	79.7	3.6	19ID	
	49% Peg 400	87.5	134.5	78.3	3.5	X25	
K2PtCl4	92.2	135.3	80.3	4.0	X25	
SeMet	Direct Freeze	92.7	149.5	80.0	3.5	X25	
	40% Peg 400	92.5	145.6	80.1	3.5	19 ID	
	49% Peg 400	88.4	134.8	79.2	3.6	X25	
Y1 Mutant	102.9	156.7	69.8	3.2	8BM