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Fig. 1. Reduced TrkA mRNA in P0 Brn3a-null or double-null trigeminal ganglia. Low (A1-A4) and high (B1-B4) magnification pictures of TrkA mRNA in situ hybridization signal, showing that Brn3a-null (A3,B3) and double-null (A4,B4) ganglia have reduced TrkA mRNA compared with control (A1,B1) and Bax-null ganglia (A2,B2), respectively. As a control, (C1-C4) NCAM mRNA signal is similar in all four genotypes.