Algorithms|Amino Acid Sequence|Amino Acids|Cluster Analysis|Conserved Sequence|Evolution, Molecular|Gene Expression Profiling|Models, Molecular|Molecular Sequence Data|Phylogeny|Protein Conformation|Protein Structure, Tertiary|Proteins|Sequence Alignment|Sequence Analysis, Protein|Sequence Homology, Amino Acid|Software|Structure-Activity Relationship|src Homology Domains