Expression of TRP mRNAs in each individual segment of the vertebral column. Comparison of expression levels of TRP channel genes in samples from isolated TG and DRGs (n=3 or 4). The colour code scale represents the average relative expression from all experiments. All corresponding numerical values are deposed in Additional file 2: Table S1. C1-7 – cervical segments; T1-13 – thoracic segments; L1-6 – lumbar segments; S1 – sacral segment.