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ADDITIONS AND CORRECTIONS

In Fig. 4 of the above mentioned manuscript we identified an ;55-kDa S-labeled band as the mature type I TGF-b receptor which was not altered in its turnover by exogenous (10 ng/ml) recombinant TGFb1. For this experiment, receptor turnover was assessed in the absence of glycosidases. In a recent paper, Dr. Wells et al. (1) identify two species of type I receptors: an Endo H-sensitive population with a half-life of about 3 h and an Endo H-resistant population. By subtracting the amount of Endo H-sensitive receptor from the total amount (N-glycosidase F-treated) of TGF-bRI, the authors estimate that no more than 50% of the pulse-labeled TGF-bRI is converted to an Endo H-resistant form. The half-life of the latter could be estimated in excess of 2.5 h. The metabolic stability of the Endo Hsensitive receptor was not altered by exogenous TGFb1 (Fig. 4B). However, since the total receptor population was less stable in the presence of exogenous ligand, the authors correctly infer that the Endo H-resistant, mature TGF-bRI is less stable in the presence of TGFb1 (Fig. 4C). Therefore, it is likely that the type I receptor band in our paper represents the Endo H-sensitive population and not the total TGF-bRI as pointed out by Wells et al. (1). Hence, our conclusion that the half-life of TGF-bRI is not appreciably affected by exogenous TGF-b1 should apply only to the Endo H-sensitive TGF-bRI as correctly assessed by Wells et al. (1).