Table 1.

Cryo-EM data collection statistics

	Bead (EMDB-13984)	Arm (EMDB-13986)
Magnification	64,000×	64,000×
Voltage (kV)	300	300
Electron exposure (e− Å−2)	66	66
Defocus range (μm)	2–5	2–5
Pixel size (Å)	2.22	2.22
Symmetry imposed	C2	C2
Initial particle images	27,737	27,737
Final particle images	7,139	4,957
Map resolution (Å)	9.7	18.3
FSC threshold	0.143	0.143
Map resolution range (Å)	4.6.0–36.7	13.6–24.2

The EMDB accession codes for the fibrillin bead and arm regions are EMD-13984 and EMD-13986, respectively. FSC, Fourier shell correlation.