File Name : figs1.pdf

Caption : fig s1. apms extension properties at pulling rates of 0.05 σ/t_s and the association energy between actin and spectrin end is 0.86 ev.

File Name : figs2.pdf

Caption : fig. s2 apms extension and recovery properties. 

File Name : figs3.pdf

Caption : fig s3. apms extension properties when 1, 2, 6, 12, and 24 spectrin filaments are attached to the actin rings and the langevin equation is implemented. 

File Name : figs4.pdf

Caption : fig. s4: apms extension properties under different extension rates.

File Name : figs5.pdf

Caption : fig s5. apms extensional relaxation properties at pulling rates of 0.05 σ/t_s. 

File Name : figs6.pdf

Caption : fig s6. mechanical model for the viscoelastic response of apms to extension and its behavior. 

File Name : figs7.pdf

Caption : fig s7. apms extensional relaxation properties at pulling rates of 0.40 σ/t_s. 

File Name : figs8.pdf

Caption : fig s8. apms extension properties when 1, 2, 6, 12, and 24 spectrin filaments are attached to the actin rings and the langevin equation is not implemented. 

File Name : figs9.pdf

Caption : fig s9. apms extension properties when all spectrin filaments (39 filaments) are attached to the actin rings. 

File Name : figs10.pdf

Caption : fig s10. apms extensional relaxation properties at pulling rates of 0.40 σ/t_s.