We recently cloned a novel osmotic stress transcription factor 1 (OSTF1) from gills of euryhaline tilapia (Oreochromis mossambicus) and demonstra-ted that acute hyperosmotic stress transiently increases OSTF1 mRNA and protein abundance [Fiol DF, Ku¨ltz D (2005) Proc Natl Acad Sci USA 102, 927–932].