Nerve growth factor (NGF) and its high affinity receptor, tyrosine kinase A (TrkA) are essential for nervous system development. Recently, it has been shown that these members of the neurotrophin family are also involved in murine hair morphogenesis and cycling. However, it remains to be elucidated whether NGF and other neurotrophins play any role in human skin and hair biology. ... إقراء المزيد