The complex between BMP-2, a TGF-beta family member, and its high affinity
receptor provides new Insights into the assembly of receptor complexes for
members of the cystine-knot growth factor family. A novel proposal for the
interaction between Flt3L and its receptor suggests a general scheme for th
e interaction of closely related receptor tyrosine kinases with structurall
y diverse ligands, including certain members of the TGF-beta family.