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Average normalized synaptic zinc optical density (OD) in layer IV, supragranular II/III, and infragranular V/VI (a–c), and average white matter (WM) normalized synaptic zinc (OD) in layer IV, supragranular II/III, and infragranular V/VI (d–f) in different visual cortical areas at different postnatal ages. Adult mean values are plotted on the right for comparison. Error bars represent ±SEM
