In zebrafish, aldh9a1 has three additional copies. The parent gene aldh9a1.1 and aldh9a1.3 reside on Chr 8; aldh9a1.2 is found on Chr 2. Both aldh9a1.2 and aldh9a1.3 encode putative full-length proteins which respectively share 71.2 per cent and 94.9 per cent AA identity with Aldh9a1.1 and 70.3 per cent sequence identity with each other. Zebrafish also contains a duplication of aldh18a1. The aldh18a1.2 is found on the same chromosome and encodes a protein that is 100 per cent identical with that of the parent gene.
