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. 2012 Jan 6;7(1):e29457. doi: 10.1371/journal.pone.0029457

Figure 5. mRNA expression of control genes in avian vocal learners and non-learners.

Figure 5

(A–E) ER81, used as an arcopallium control gene. (F–J) GDNF family receptor alpha 1, used as a brainstem motor neuron control gene. Species are labeled above the panels. Scale bar = 2 mm (applies to all the images).