“…The tissue disks were cryo-embedded in 2% sodium carboxymethylcellulose (CMC). Cryosections (8 μm) were thaw-mounted onto indium tin oxide (ITO)-coated slides (Delta Technologies, Loveland, CO) and coated by sublimation with 2,5-dehydroxybenzoic acid (DHB; Sigma-Aldrich Co, St. Louis, MO) as matrix (Angel, Spraggins, Baldwin, & Caprioli, 2012; Emine B. Yalcin, Nunez, Cornett, & de la Monte, 2015; E.B. Yalcin, Nunez, Tong, Cornett, & de la Monte, 2015).…”