3GF1<unk> macromolecular structure The<unk> s <unk> s) are proteins with high sequence similarity to<unk> .<unk> s are part of a complex system that cells use to communicate with their physiologic environment. This complex system (often referred to as the<unk>  "axis") consists of two cell-surface receptors <unk> 1R and<unk> 2R), two ligands<unk>  1 <unk> -1) and<unk>  2 <unk> -2)), a family of seven high-affinity<unk> -binding proteins <unk> BP1 to<unk> BP7), as well as associated<unk> BP degrading enzymes, referred to collectively as proteases.
Insulin-like growth factor
Keratinocyte growth factor
Growth hormone
Orexin
Neurotrophic factors
Neurohormone
Bryostatin
Hemopoietic growth factor