. . . "Definition: Describes a site on a sequence, i.e. the position of a single nucleotide or amino acid."^^ . "Definition: Describes a site on a sequence, i.e. the position of a single nucleotide or amino acid."^^ . "Definition: Describes a site on a sequence, i.e. the position of a single nucleotide or amino acid."^^ . . . . . . . . . .