Scientists in Taiwan have created a two-headed genetically modified Zebra danio which glows in the dark, according to The Taipei Times.
The fish, Danio rerio, was produced accidentally by Huang Chang Jen, Associate Research Fellow at the Academia Sinica Institute of Biological Chemistry and was the only one in 200 embryos produced using a gene microinjection technique at the one-cell stage.
The fry, which is still alive, was later found to have two hearts and two heads. The two-headed fish has inspired its creator to start studying the processes that cause conjoined twins to develop.
It is hoped that the research could allow the development of drugs that counter the development of siamese twins.