 Secondary structure : regularly repeating local structures stabilized by hydrogen bonds . The most common examples are the α @-@ helix , β @-@ sheet and turns . Because secondary structures are local , many regions of different secondary structure can be present in the same protein molecule . 
 Secondary structure : regularly repeating local structures stabilized by hydrogen bonds . The most common examples <a href='drop_aux' title='1'><mark>are</mark></a>the α @-@ helix , β @-@ sheet and turns . Because secondary structures <a href='drop_aux' title='2'><mark>are</mark></a>local , many regions of different secondary structure can be present in the same protein molecule . 
Secondary structure : regularly repeating local structures stabilized by hydrogen bonds . The most common examples the α @-@ helix , β @-@ sheet and turns . Because secondary structures local , many regions of diffrent secondary structure can b present in da same protein molecule .