The GloFish is a trademarked transgenic zebrafish (Danio rerio) expressing a red fluorescent protein from a sea anemone under the transcriptional control of the promoter from the myosin light peptide 2 gene of zebrafish1. Produced and patented by a group at the National University of Singapore, exclusive rights for international marketing were purchased by Yorktown Technologies approximately a year-and-a-half ago. Yorktown produces GloFish through contracts with 5-D Tropical (Plant City, FL) and Segrest Farms (Gibsonton, FL), and began marketing them in the United States in December