(A) & (C) Ribbon diagram of structure of UNC-60A and UNC-60B, respectively. The individual β strands and α helices are labelled. In UNC-60A, the β-strands are β1 (M6-V7), β2 (I29-I32), β3 (I38-A42), β4 (C80-C91), β5 (S99-I109) and β6 (L139-V143), and the α-helices are α1 (D10-E20), α2 (K60-T74), α3 (I116-L133) and α4 (H151-K161). In UNC-60B, the β-strands are β1 (K6-V7), β2 (S25-D32), β3 (T36-G44), β4 (R68-V78), β5 (T86-V97) and β6 (Q128-A131), and the four helices correspond to α1 (P10-K21), α2 (Y50-E62), α3 (V104-L121), and α4 (E139-Q150) (B) & (D) Superimposition of backbone traces from final ensemble of 10 structures of UNC-60A and UNC-60B, respectively.