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. 2019 May 8;13:459. doi: 10.3389/fnins.2019.00459

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Copyright © 2019 Siemann, Green, Reddy and McMahon.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Schematic of developmental photoperiod paradigm. Animals were maintained on Equinox (Eq) (A), Long (L) (B), or Short (S) (C) photoperiods from E0 to P30 or P50. One cohort of animals developed from E0 under Long photoperiods and were switched to Short photoperiods (L-S) at birth (P0) (D). Another cohort of animals were developed from E0 under Short photoperiods and were switched to a Long photoperiod at birth (S-L) (E). Experiments were performed at two different time points: P30 (i) or P50 (ii). Photoperiods were defined as follows: Equinox, LD 12:12; Long, LD 16:8; Short, LD 8:16 where L, light; D, dark (i.e., LD 8:16 means Light for 8 h, Dark for 16 h).