Chromosomal locations of Arabidopsis snRNAs. Chromosomes 1 to 5 are represented to scale by the long thick lines in dark green. The small bars above the chromosomes indicate the presence of an snRNA gene in that region. Different colors represent different snRNA types: red, U1 snRNA; magenta, U2 snRNA; blue, U4 snRNA; green, U5 snRNA; yellow, U6 snRNA; black, minor snRNA. The seven U1-U4 snRNA gene clusters (red-blue) and the single U2-U5 snRNA gene cluster (magenta-green) are indicated by red circles.
Wang and Brendel Genome Biology 2004 5:R102 doi:10.1186/gb-2004-5-12-r102