U3 small nuclear RNA can be psoralen-cross-linked in vivo to the 5' external transcribed spacer of pre-ribosomal-RNAMASER, R. L; CALVET, J. P.Proceedings of the National Academy of Sciences of the United States of America. 1989, Vol 86, Num 17, pp 6523-6527, issn 0027-8424, 5 p.Article

U6 small nuclear RNA is transcribed by RNA polymerase IIIKUNKEL, G. R; MASER, R. L; CALVET, J. P et al.Proceedings of the National Academy of Sciences of the United States of America. 1986, Vol 83, Num 22, pp 8575-8579, issn 0027-8424Article