Gene structures and promoter characteristics of interferon regulatory factor 1 (IRF-1), IRF-2 and IRF-7 from snakehead Channa argus
in each treatment. Heartbeat stage was more tolerant against chilling at 2 C for 3 h exposure in Me2SO
followed by MeOH, sucrose and EG. Further studies will be conducted to find the best method to preserve
embryos for long term storage.