The Drosophila gene osa encodes a putative DNA binding protein that contains an AT-rich interaction domain (ARID). It interacts genetically with Antp, ro, brm, Pc, Scr, and several other genes. Similar sequences have been identified in Caenorhabditis elegans, Homo sapiens, Mus musculus, and Saccharomyces cerevisiae. (from FlyBase 0003013 and NCI) [ ]