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BY WILLIAM F. LOOMIS
Department of Biology
University of California, San Diego
La Jolla, Calif.
"U2 is a small nuclear RNA less than 200 bases long in metazoans but is a long molecule of 1,175 bases in yeast. Only 100 bases at each end of the yeast molecule are homologous to metazoan U2. These 200 bases are sufficient for all of the functions of U2 in yeast.
A.H. Igels, M. Ares,...