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. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: Neurotoxicol Teratol. 2014 Dec 17;48:40–48. doi: 10.1016/j.ntt.2014.12.003

Fig. 1.

Fig. 1

Timeline of experimental methods and procedures. Rats were weaned on postnatal day 21 (P21). Osmotic pumps containing either nicotine or vehicle were implanted on P26 and rats in the Stress groups began receiving twice-daily injections of saline on P26. Osmotic pumps were removed and stress injections were discontinued on P53. Starting on P63, all rats completed 2 days of shaping followed by 35 days of serial pattern learning training (ending in P99).