All experiments were approved by the University of Michigan Institutional Animal Care and Use Committee and were in accordance with NIH guidelines for the care and use of laboratory animals. Animals were kept on a 12-h day/night cycle with ad libitum access to food and water. VIP-IRES-Cre mice (VipTM 1(cre)Zjh/J, Jackson Laboratory, stock # 010908) (Taniguchi et al., 2011 (link)) were crossed with Ai14 reporter mice (B6.Cg-Gt(ROSA)26SorTM 14(CAG–tdTomato)Hze/J, Jackson Laboratory, stock #007914) (Madisen et al., 2010 (link)) to yield F1 offspring that expressed the fluorescent protein tdTomato in VIP neurons. Because mice on the C57BL/6J background undergo age-related hearing loss, experiments were restricted to mice aged P30 – P85, an age range where hearing loss should be minimal or not present (Zheng et al., 1999 (link)).
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