Structural and immunological comparison of human thrombospondin isolated from platelets and from culture supernatants of endothelial cells and fibroblasts. Evidence for a thrombospondin polymorphism - Clezardin, P; Hunter, N R; Lawler, J W; Pratt, D A; McGregor, J L; Pepper, D S; Dawes, J (Eur J Biochem, 1986)