Protein seqeunce-sequence alignment: M. O. Dayhoff, R. M. Schwartz, B. C. Orcutt. A model of evolutionary change in proteins. in Atlas of protein sequence and structure, Volume 5 (M. Dayhoff, ed.). National Biomedical Research Foundation, Washington, D.C. 1978, Pages 345-352 Description: PAM matrix (construct a score matrix for guide protein sequence alignment) (Download PDF file) S. Henikoff, J