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Variation in the form of Pavlovian conditioned approach behavior among outbred male Sprague-Dawley rats from different vendors and colonies: sign-tracking vs. goal-tracking.
Fitzpatrick CJ, Gopalakrishnan S, Cogan ES, Yager LM, Meyer PJ, Lovic V, Saunders BT, Parker CC, Gonzales NM, Aryee E, Flagel SB, Palmer AA, Robinson TE, Morrow JD. Fitzpatrick CJ, et al. PLoS One. 2013 Oct 1;8(10):e75042. doi: 10.1371/journal.pone.0075042. eCollection 2013. PLoS One. 2013. PMID: 24098363 Free PMC article.