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Volume 67, no. 11, p. 5621–5625, 1999. Page 5622, column 1, line 8 from bottom: “1.8 and 6.0 kb” should read “2.0 and 15.0 kb.”
Page 5623, column 1, lines 5 and 6 from bottom: “1.8 to 6.0 kb” should read “2.0 to 15.0 kb.”
Page 5623, column 2, line 11 from bottom: “1.8 and 6.0 kb” should read “2.0 and 15.0 kb.”
Page 5623, column 2, lines 9 and 10 from bottom: “2.3 and 5.0 kb” should read “4.0 and 13.0 kb.”
Page 5623, column 2, Fig. 3: Figure 3 should appear as shown below. 
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