Broad-sense heritability

H2 = VG/VP

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Lioyd and Hunt, applies only to sensory nerve fibers and uses a Roman numeral nomenclature of I, II, III, and IV

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Neurotrophins 

Necessary for survival and growth of neurons

In the CNS produced by astrocytes

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High affinity Neurotrophins  receptors

Tyrosine kinase associated (Trk) receptors 

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Low-affinity NGF receptor

p75 NTR (also called NTR 5 neurotrophin receptor) 

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p75 NTR forms heteromeric complexes with the different Trk receptors and enhances Trk receptor signaling

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Schwann cells and astrocytes produce ciliary neurotrophic factor which promotes the survival of damaged and embryonic spinal cord neurons