<p>Histograms show size distribution of spectrin species obtained by DLS measurements of erythroid spectrin in (A) native; (B) unfolded in 8M urea and (C) unfolded in 6M GuHCl and of non-erythroid spectrin in (D) native; (E) unfolded in 8M urea and (F) unfolded in 6M GuHCl.</p