May function as an adapter molecule downstream of KIT in the proliferation or differentiation of hematopoietic stem cells. Interacts with URI1; the interaction is phosphorylation-dependent occurs in a growth-dependent manner (By similarity). Interacts with KIT and CSF1R. Expression restricted to the bone marrow. Phosphorylated on tyrosine by TEC. Phosphorylated on tyrosine by KIT.