Stem cell factor (SCF) is a homodimer involved in hematopoiesis. SCF binds to and activates the SCF receptor (SCFR), a receptor tyrosine kinase. The crystal structure of human SCF has been resolved and a potential receptor-binding site identified [1].

1: Crystal structure of human stem cell factor: Implication for stem cell factor receptor dimerization and activation. Zhang Z, Zhang R, Joachimiak A, Schlessinger J, Kong XP; Proc Natl Acad Sci U S A 2000;97:7732-7737. PMID:10884405