Table 1. Data collection and refinement statistics.

	aεFab1–IgE-Fc–aεFab2
Data collection
Space group	P2l2121
Cell dimensions
a, b, c (Α̊)	84.59, 100.81, 219.68
α, β, γ (°)	90.0, 90.0, 90.0
Resolution (Α̊)	2.91 (2.98 – 2.91)*
R merge	0.055 (0.796)
I / σI	18.4 (3.0)
Completeness (%)	99.7 (99.2)
Redundancy	5.7 (6.0)
Refinement
Resolution (Α̊)	67.01 – 2.91
No. unique reflections	41987 (3078)
Rwork / Rfree	0.236 / 0.284
No. atoms	11712
Protein	11541
Ligand/ion	122
Water	49
β factors
Protein	103.8
Ligand/ion	110.9a
Water	88.4
r.m.s. deviations
Bond lengths (Α̊)	0.010
Bond angles (°)	1.566

^*Values in parentheses are for highest-resolution shell.