It is shown that Drosophila melanogaster has Xmas mRNA whose alternative splicing leads to the formation of three transcripts: Xmas, Xmas-2, and Xmas-1. As a result, three proteins are synthesized: Xmas, Xmas-2, and, presumably, Xmas-1. The size of the Xmas protein is close to the size of its homologue in humans. Adult flies contain large amounts of this protein, whereas in embryos it is absent.