Volume 20, no. 11, p. 4036–4048, 2000. Page 4039, Fig. 2 legend, line 4: “as” should read “was.”
Page 4042, column 1, line 5: “lane 2 with 5 and 3 with 6” should read “lanes 2 and 6 and compare lanes 3 and 7.”
Page 4043, line 6 from bottom: “Fig. 7B” should read “Fig. 8B.”
Page 4044, Fig. 8 legend, line 7: “(Fig. 1A)” should read “(Fig. 5).”
Page 4047, reference 45: should read “Mayeda, A., and A. R. Krainer. 1999. Mammalian in vitro splicing assays. Methods Mol. Biol. 118:315–321.”
