Table 1. Root mean square deviations (based on C_α atoms) for overlays of the published RXLR effector structures (only the A-chains of ATR1 and PexRD2 were considered).

Effector	ATR1-WY1	ATR1-WY2	AVR3a4	PexRD2
AVR3a11	1.72 Å	1.86 Å	0.85 Å	0.73 Å
ATR1-WY1		2.12 Å	1.75 Å	1.30 Å
ATR1-WY2			1.83 Å	0.94 Å
AVR3a4				0.93 Å

Residues used in the overlays are those within the conserved helices of each structure as revealed by pair-wise comparisons.