Dynamics of Calretinin and Reelin expression in the developing opossum telencephalon. (Aa-d) Time course immunoprofiling of Calretinin (Calb2) from P1 to P12. (Aa'-d') Magnifications of boxed areas in (Aa-d). (Ae-f) Comparisons among distributions of Calretinin, Pax6 (Ae,e') and Tle4 (Af). (B) In situ hybridization of Reelin (Reln) mRNA on coronal sections of P3, P6 and P15 opossum telencephalons. (Ba'-d") are magnifications of boxed areas in (Ba-d). Abbreviations: II-IV, V, VI refer to cortical layers; cp, cortical plate; iz, intermediate zone; mz, marginal zone; ppl, preplate; sp, subplate; vz, ventricular zone. Scale bars: 100 μm. Arrowheads in A point to Calb2+ cells within the ppl (a,a'); arrowheads in B point to Reln+ neurons at around the septo-pallial border (b,b'), in the neocortical marginal zone (c,c'), the cortical hem (c,c",d,d"), the neocortical outer cortical plate (d,d').