How amino-acid insertions are allowed in an alpha-helix of T4 lysozyme.
Heinz, D.W., Baase, W.A., Dahlquist, F.W., Matthews, B.W.(1993) Nature 361: 561-564
- PubMed: 8429913 
- DOI: 10.1038/361561a0
- Primary Citation of Related Structures:  
- PubMed Abstract: 
Studies of extant protein sequences indicate that amino-acid insertions and deletions are preferentially located in loop regions, which has traditionally been explained as the result of selection removing deleterious mutations within secondary struct ...