Table 2 Human primer sequences for quantitative real time polymerase chain reaction (F, forward; R, reverse).

Primer name	Sequence
β‐actin F	5′‐TCA CCC ACA CTG TGC CCA TCT ACG‐3′
β‐actin R	5′‐CAG CGG AAC CGC TCA TTG CCA ATG‐3′
TNF‐α F	5′‐GGA GAA GGG TGA CCG ACT CA‐3′
TNF‐α R	5′‐CTG CCC AGA CTC GGC AA‐3′
MOR F	5′‐ATG CCA GTG CTC ATC ATT AC‐3′
MOR R	5′‐GAT CCT TCG AAG ATT CCT GTC CT‐3′

MOR, µ opioid receptor; TNF‐α, tumour necrosis factor α.