L B Bernstein et al.
Molecular and cellular biology, 5(9), 2159-2171 (1985-09-01)
The DNA immediately flanking the 164-base-pair U1 RNA coding region is highly conserved among the approximately 30 human U1 genes. The U1 multigene family also contains many U1 pseudogenes (designated class I) with striking although imperfect flanking homology to the