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Figure 2: Expression of NRG1 𝛽 and ErbB4 proteins in the rat hippocampus. (a) Representative Western blots of NRG1 𝛽 protein isoforms. (b) Quantitative analysis of NRG1 𝛽 immunoblots. (c) Representative Western blots of ErbB4 protein isoforms. (d) Quantitative analysis of ErbB4 immunoblots. The data were normalized by taking the value of vehicle group as 100% and expressed as means ± S.E.M. ( 𝑛 = 5). 𝑃 < . 0 5 . (e) Representative section of NRG1 𝛽 immunohistochemistry in the hippocampal CA1 region from vehicle group. (f) Representative section of NRG1 𝛽 immunohistochemistry in the hippocampal CA1 region from MK-801-treated group. (g) Representative section of NRG1 𝛽 immunohistochemistry in the hippocampal CA3 region from vehicle group. (h) Representative section of NRG1 𝛽 immunohistochemistry in the hippocampal CA3 region from MK-801-treated group. (i) Representative section of NRG1 𝛽 immunohistochemistry in the hippocampal DG region from vehicle group. (j) Representative section of NRG1 𝛽 immunohistochemistry in the hippocampal DG region from MK-801-treated group. Arrows indicate NRG1-expressing neurons in the hippocampus. Scale bar for (e)–(j): 50  𝜇 m.