The International Society for Transgenic Technologies (ISTT), is pleased to announce the co-sponsorship of the I International Scientific Meeting for the Optimization of Murine Models in Research, that will be held at the Centro de Estudios Cientificos (CECs), in Valdivia, Chile, on 24-26 January 2012. This meeting is organized by Juan Manuel Baamonde (CECs, Chair), and the ISTT Members Fernando Benavides (MD Anderson CC, Smithville, TX, USA) and Jorge Sztein (NIH/NIAID, USA), along other CECs scientists. The meeting will be followed by the III Practical Course CECs: Mouse sperm freezing according to JAX method, coordinated by Dr. Jorge Sztein, on 27 January 2012. Talks will be given in Spanish, Portughese or English. ISTT members are entitled to a reduced registration fee, both for the meeting and the course. The practical course is limited to 15 participants. Early bird registration deadline is October 15, 2011.