The results imply that both the pain excitatory neuron and the pain in-habitory neuron may play a role in nociception or Dain modulation in the formalin pain model.

Moreover, antinociceptive effect of CAI on inflammatory pain was assessed using acetic acid-induced writhing model and the formalin test.

Owing to the DNA degradation induced by formalin and the obstruction of paraffin to DNA extraction, it is difficult to recover high-quality DNA from Formalin fixed and paraffin embedded tissue(FFPET).