Identification and expression of two forms of the human transforming growth factor-β-binding protein endoglin with distinct cytoplasmic regions - Bellón, T; Corbí, A; Lastres, P; Calés, C; Cebrián, M; Vera, S; Cheifetz, S; Massagué, J; Letarte, M; Bernabéu, C (Eur J Immunol, 1993)