Mice were group housed (two to five animals per cage) in a colony under a 12/12 h light/dark cycle. Food and water were available ad libitum. C57BL/6 (n = 10), DAT-ires-cre (n = 4), DAT-ires-Cre::Ai14 (n = 17), and VGlut2-ires-Cre::Ai14 (n = 9) were used in this study. All mice were two to five months old male. In this study, we focused on the histochemical character of males. DAT-ires-Cre mice (stock #006660; Bäckman et al., 2006 (link)) and Ai14 mice (stock #007908; Madisen et al., 2010 (link)) were purchased from The Jackson Laboratory. VGlut2-ires-Cre mice (Vong et al., 2011 (link)) were provided by Dr. Brad Lowell (Beth Israel Deaconess Medical Center, Harvard Medical School).
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