Table 1.

Primers used for polymerase chain reaction amplification

Genes	Forward primer	Reverse primer
NGF	5’-CCTGAAGCCCACTGGACTAA-3’	5’-TACAGTGATGTTGCGGGTCT-3’
GDNF	5’-CGGGCCACTTGGAGTTAATG-3’	5’-ACAGCCACGACATCCCATAA-3’
BDNF	5’-GTAAACGTCCACGGACAAGG-3’	5’-ATGTCGTCGTCAGACCTCTC-3’
CNTF	5’-GAGCAATCACCTCTGACCCT-3’	5’-CCACTGGTACACCATCCACT-3’
NTF3	5’-CCCGGTGGTAGCCAATAGAA-3’	5’-CAATGGCTGAGGACTTGTCG-3’
NTF4/5	5’-CCTGCGTCAGTACTTCTTCG-3’	5’-AGGACTGCTTAGCCTTGCAT-3’

NGF: Nerve growth factor; GDNF: Glial cell line-derived neurotrophic factor; BDNF: Brainderived neurotrophic factor; CNTF: Ciliary neurotrophic factor; NTF3: Neurotrophic factor 3; NTF4/5: Neurotrophic factor 4/5.