Non-isotopic detection of nucleolar transcription in pre-implantation mouse embryos Karel Kobema, Vladimír Landa, Jiří Kaňka, Artem Pliss, Michail Eltsov, David Staněk and Ivan Raška Reprod. Nutr. Dev., 38 1 (1998) 117-126 DOI: 10.1051/rnd:19980110