Alignment of IL7 amino acid sequences in 17 vertebrate species.

<p>The six conserved cysteine residues were marked by dark gray. “*” indicated that all residues in that column were identical in all sequences. Conserved substitutions were marked by “:”. Semi-conserved substitutions were marked by “.”. Signal peptide region was marked in box. Sequence ID information was presented in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0099859#pone.0099859.s005" target="_blank">Table S1</a>.