Selection of reference genes for quantitative real-time PCR in equine <it>in vivo </it>and fresh and frozen-thawed <it>in vitro </it>blastocysts oleh Galli Cesare, Vanhaesebrouck Emilie, Hoogewijs Maarten, Govaere Jan, Van Soom Ann, Goossens Karen, Smits Katrien, Colleoni Silvia, Vandesompele Jo, Peelman Luc