First published March 15, 1999 - More info
J. Clin. Invest.103:453–460 (1999).
A production error resulted in the incorrect printing of Figure 1; the correct display appears below. We regret the error and have provided corrected reprints to the corresponding author: Barton F. Haynes, Box 3703, Duke Hospital, Durham, North Carolina 27710, USA. Phone: (919) 684-5384; Fax: (919) 681-8992; E-mail: Hayne002@mc.duke.edu1