Amino acid sequences of zebrafish CX chemokines. Sequences were aligned with CLUSTAL W. The five CC chemokines closely related to the CX chemokines are also shown. Solid boxes indicate the conserved four cysteine residues and the tryptophan residues often found seven a.a. downstream from the fourth cysteine residue. Dotted boxes denote the additional cysteine residues conserved among CX chemokines. Predicted signal sequences are underlined.