Fig. 2.

Heat map of the changes in mRNA levels of MOR-1 splice variants by region. The relative abundance of the different variants in saline and both morphine treatment groups is presented in various brain regions. The heat map cluster is based upon the values [Log₂ (E^−∆C(t)] plotting from the highest level (left, red) to the lowest level (right, green). BS, brainstem; Cb, cerebellum; Hip, hippocampus; Hyp, hypothalamus; PAF, periaqueductal gray; PFC, prefrontal cortex; SpC, spinal cord; Str, striatum; Thal, thalamus; WB, whole brain.