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. Author manuscript; available in PMC: 2011 Apr 1.
Published in final edited form as: Brain Res Brain Res Rev. 2004 Oct;46(2):204–215. doi: 10.1016/j.brainresrev.2004.07.003

Fig. 2.

Fig. 2

Plot of average divergence for extracellular opioid receptor domains by type. Each domain for all three receptors in five species was analyzed in an average distance matrix to yield mean (±S.E.) for each domain by type using the MEGA2 software.