aligment with identity and homology percentages

[Georg van der Staay]

Greetings,

I am looking for a program (preferentially for the Mac) that 
calculates the percentages of identical and homologous amino acids 
from pairwise alignments of proteins.
Thanks in advance
Georg
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Georg van der Staay
Station Biologique (UPMC - CNRS - INSU)        
BP 74 
29682 Roscoff Cedex 
France      
e-mail:vds at sb-roscoff.fr 
Tel: (33) 2 98 29 23 23
Fax: (33) 2 98 29 23 24