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Fig. 1. Paxillin Kozak sequence comparison and paxillin family domain structure. (A) Alignment of the paxillin {alpha} and {delta} Kozak nucleotide sequence (Kozak, 1987) from various species. Nucleotides are labeled as follows: G, guanine; C, cytosine; A; adenine; U, uracil; R, purine; aug#, methionine start codon with amino acid position. Shaded residues are most highly conserved and required for ribosome recognition. (B) Avian paxillin {alpha}, paxillin {delta} and Hic-5 domain structure. Paxillin {alpha} is 559 amino acids and paxillin {delta} is 427 amino acids in length (amino acid numbers in parentheses represent position within paxillin {alpha}). Hic-5 Tyr60 residue is a potential Csk binding site (Thomas et al., 1999).