Table 2. Ellipticities at 222 nm and wavelengths of maximum tryptophan fluorescence of two-repeat fragments of spectrin.

Fragment	θ*	Fluorescence†, nm	Mr‡, g/mol
CBα15,16	-28,032 ± 287	330	26,035 ± 779
HEα1,2	-24,554 ± 3,539	335	27,435 ± 237
HEα2,3	-26,739 ± 4,528	328	21,856 ± 260
HEα4,5	-18,483 ± 568	340	25,362 ± 208
HEβ8,9	-29,216 ± 644	340	21,719 ± 80
HEα13,14	-18,618 ± 2,181	340	23,551 ± 514

^*Molar ellipticity ± standard error at 222 nm and 10°C in degree·cm²·dmol^-1

^†Wavelength of maximum tryptophan emission

^‡Molecular weight ± standard error by analytical ultracentrifugation; protein concentrations ranged from 0.1 to 1 mg/ml