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In situ hybridization for NMDA subunits in different ages of mice. Film autoradiograms of the hybridized mRNA for ζ1 (A–C), ε1 (E–G), and ε2 (I–K) subunit of the NMDA receptor in 3 (A, E, I)-, 10 (B, F, J)-, and 30 (C, G, K)-month-old mice. D, H, L, Densities (counts per minute per milligram of tissue) of binding for different gray levels for the ζ1 probe in A–C(D), ε1 probe in E–G(H), and ε2 probe in I–K(L).
